diff --git a/CHANGES.md b/CHANGES.md
index 67f129a0..5048793a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # Changes
 
+## [0.7.0-b.7] - 2021-08-16
+
+* v3: Boxed Packet::Connect to trim down Packet size
+* v5: Boxed Packet::Connect and Packet::ConnAck variants to trim down Packet size
+
 ## [0.7.0-b.6] - 2021-07-28
 
 * v3/v5: Fixed nested with_queues calls in sink impl
diff --git a/Cargo.toml b/Cargo.toml
index c1c6d47f..38007297 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "ntex-mqtt"
-version = "0.7.0-b.6"
+version = "0.7.0-b.7"
 authors = ["ntex contributors <team@ntex.rs>"]
-description = "MQTT Client/Server framework for v5 and v3.1.1 protocols"
+description = "Client and Server framework for MQTT v5 and v3.1.1 protocols"
 documentation = "https://docs.rs/ntex-mqtt"
 repository = "https://github.com/ntex-rs/ntex-mqtt.git"
 categories = ["network-programming"]
@@ -12,7 +12,7 @@ exclude = [".gitignore", ".travis.yml", ".cargo/config"]
 edition = "2018"
 
 [dependencies]
-ntex = { version = "0.4.0-b.1", default-features = false }
+ntex = { version = "0.4.0-b.2", default-features = false }
 bitflags = "1.2"
 derive_more = "0.99"
 log = "0.4"
@@ -28,4 +28,4 @@ tokio-rustls = "0.22"
 openssl = "0.10"
 tokio-openssl = "0.6"
 
-ntex = { version = "0.4.0-b.1", features = ["rustls", "openssl"] }
+ntex = { version = "0.4.0-b.2", features = ["rustls", "openssl"] }
diff --git a/examples/basic.rs b/examples/basic.rs
index 9c8db283..e4239a1a 100644
--- a/examples/basic.rs
+++ b/examples/basic.rs
@@ -46,6 +46,11 @@ async fn publish_v5(publish: v5::Publish) -> Result<v5::PublishAck, ServerError>
 
 #[ntex::main]
 async fn main() -> std::io::Result<()> {
+    println!("{}", std::mem::size_of::<v5::codec::Publish>());
+    println!("{}", std::mem::size_of::<v5::codec::PublishProperties>());
+    println!("{}", std::mem::size_of::<v5::codec::Packet>());
+    println!("{}", std::mem::size_of::<v5::Handshake<ntex::rt::net::TcpStream>>());
+    println!("{}", std::mem::size_of::<v5::error::MqttError<()>>());
     std::env::set_var("RUST_LOG", "ntex=trace,ntex_mqtt=trace,basic=trace");
     env_logger::init();
 
diff --git a/src/v3/client/connector.rs b/src/v3/client/connector.rs
index 3fec825f..ff9e478e 100644
--- a/src/v3/client/connector.rs
+++ b/src/v3/client/connector.rs
@@ -256,7 +256,7 @@ where
             let state = State::new();
             let codec = codec::Codec::new().max_size(max_packet_size);
 
-            state.send(&mut io, &codec, codec::Packet::Connect(pkt)).await?;
+            state.send(&mut io, &codec, pkt.into()).await?;
 
             let packet = state
                 .next(&mut io, &codec)
diff --git a/src/v3/codec/decode.rs b/src/v3/codec/decode.rs
index 4d16d05a..9897983d 100644
--- a/src/v3/codec/decode.rs
+++ b/src/v3/codec/decode.rs
@@ -86,14 +86,15 @@ fn decode_connect_packet(src: &mut Bytes) -> Result<Packet, DecodeError> {
     };
     let password =
         if flags.contains(ConnectFlags::PASSWORD) { Some(Bytes::decode(src)?) } else { None };
-    Ok(Packet::Connect(Connect {
+    Ok(Connect {
         clean_session: flags.contains(ConnectFlags::CLEAN_START),
         keep_alive,
         client_id,
         last_will,
         username,
         password,
-    }))
+    }
+    .into())
 }
 
 fn decode_connect_ack_packet(src: &mut Bytes) -> Result<Packet, DecodeError> {
@@ -187,21 +188,21 @@ mod tests {
             decode_connect_packet(&mut Bytes::from_static(
                 b"\x00\x04MQTT\x04\xC0\x00\x3C\x00\x0512345\x00\x04user\x00\x04pass"
             )),
-            Ok(Packet::Connect(Connect {
+            Ok(Packet::Connect(Box::new(Connect {
                 clean_session: false,
                 keep_alive: 60,
                 client_id: ByteString::try_from(Bytes::from_static(b"12345")).unwrap(),
                 last_will: None,
                 username: Some(ByteString::try_from(Bytes::from_static(b"user")).unwrap()),
                 password: Some(Bytes::from(&b"pass"[..])),
-            }))
+            })))
         );
 
         assert_eq!(
             decode_connect_packet(&mut Bytes::from_static(
                 b"\x00\x04MQTT\x04\x14\x00\x3C\x00\x0512345\x00\x05topic\x00\x07message"
             )),
-            Ok(Packet::Connect(Connect {
+            Ok(Packet::Connect(Box::new(Connect {
                 clean_session: false,
                 keep_alive: 60,
                 client_id: ByteString::try_from(Bytes::from_static(b"12345")).unwrap(),
@@ -213,7 +214,7 @@ mod tests {
                 }),
                 username: None,
                 password: None,
-            }))
+            })))
         );
 
         assert_eq!(
diff --git a/src/v3/codec/encode.rs b/src/v3/codec/encode.rs
index 155f5fc2..11876eee 100644
--- a/src/v3/codec/encode.rs
+++ b/src/v3/codec/encode.rs
@@ -9,7 +9,7 @@ use super::packet::*;
 pub(crate) fn get_encoded_size(packet: &Packet) -> usize {
     match *packet {
         Packet::Connect ( ref connect ) => {
-            let Connect {ref last_will, ref client_id, ref username, ref password, ..} = *connect;
+            let Connect {ref last_will, ref client_id, ref username, ref password, ..} = **connect;
 
             // Protocol Name + Protocol Level + Connect Flags + Keep Alive
             let mut n = 2 + 4 + 1 + 1 + 2;
@@ -264,20 +264,20 @@ mod tests {
     #[test]
     fn test_encode_connect_packets() {
         assert_encode_packet(
-            &Packet::Connect(Connect {
+            &Packet::Connect(Box::new(Connect {
                 clean_session: false,
                 keep_alive: 60,
                 client_id: ByteString::from_static("12345"),
                 last_will: None,
                 username: Some(ByteString::from_static("user")),
                 password: Some(Bytes::from_static(b"pass")),
-            }),
+            })),
             &b"\x10\x1D\x00\x04MQTT\x04\xC0\x00\x3C\x00\
 \x0512345\x00\x04user\x00\x04pass"[..],
         );
 
         assert_encode_packet(
-            &Packet::Connect(Connect {
+            &Packet::Connect(Box::new(Connect {
                 clean_session: false,
                 keep_alive: 60,
                 client_id: ByteString::from_static("12345"),
@@ -289,7 +289,7 @@ mod tests {
                 }),
                 username: None,
                 password: None,
-            }),
+            })),
             &b"\x10\x21\x00\x04MQTT\x04\x14\x00\x3C\x00\
 \x0512345\x00\x05topic\x00\x07message"[..],
         );
diff --git a/src/v3/codec/packet.rs b/src/v3/codec/packet.rs
index 0317a990..01458d09 100644
--- a/src/v3/codec/packet.rs
+++ b/src/v3/codec/packet.rs
@@ -123,7 +123,7 @@ pub enum SubscribeReturnCode {
 /// MQTT Control Packets
 pub enum Packet {
     /// Client request to connect to Server
-    Connect(Connect),
+    Connect(Box<Connect>),
 
     /// Connect acknowledgment
     ConnectAck {
@@ -194,7 +194,7 @@ pub enum Packet {
 
 impl From<Connect> for Packet {
     fn from(val: Connect) -> Packet {
-        Packet::Connect(val)
+        Packet::Connect(Box::new(val))
     }
 }
 
diff --git a/src/v3/handshake.rs b/src/v3/handshake.rs
index b3a7148c..c8b6a798 100644
--- a/src/v3/handshake.rs
+++ b/src/v3/handshake.rs
@@ -7,12 +7,12 @@ use super::sink::MqttSink;
 /// Connect message
 pub struct Handshake<Io> {
     io: Io,
-    pkt: mqtt::Connect,
+    pkt: Box<mqtt::Connect>,
     shared: Rc<MqttShared>,
 }
 
 impl<Io> Handshake<Io> {
-    pub(crate) fn new(pkt: mqtt::Connect, io: Io, shared: Rc<MqttShared>) -> Self {
+    pub(crate) fn new(pkt: Box<mqtt::Connect>, io: Io, shared: Rc<MqttShared>) -> Self {
         Self { io, pkt, shared }
     }
 
diff --git a/src/v5/client/connection.rs b/src/v5/client/connection.rs
index 50969165..a7a8cf78 100644
--- a/src/v5/client/connection.rs
+++ b/src/v5/client/connection.rs
@@ -23,7 +23,7 @@ pub struct Client<Io> {
     keepalive: u16,
     disconnect_timeout: u16,
     max_receive: usize,
-    pkt: codec::ConnectAck,
+    pkt: Box<codec::ConnectAck>,
 }
 
 impl<T> Client<T>
@@ -34,7 +34,7 @@ where
     pub(super) fn new(
         io: T,
         shared: Rc<MqttShared>,
-        pkt: codec::ConnectAck,
+        pkt: Box<codec::ConnectAck>,
         max_receive: u16,
         keepalive: u16,
         disconnect_timeout: u16,
diff --git a/src/v5/client/connector.rs b/src/v5/client/connector.rs
index 0b3db830..8832ca16 100644
--- a/src/v5/client/connector.rs
+++ b/src/v5/client/connector.rs
@@ -253,7 +253,7 @@ where
             let state = State::new();
             let codec = codec::Codec::new().max_inbound_size(max_packet_size);
 
-            state.send(&mut io, &codec, codec::Packet::Connect(pkt)).await?;
+            state.send(&mut io, &codec, codec::Packet::Connect(Box::new(pkt))).await?;
 
             let packet = state
                 .next(&mut io, &codec)
diff --git a/src/v5/codec/decode.rs b/src/v5/codec/decode.rs
index cf178315..ff35a123 100644
--- a/src/v5/codec/decode.rs
+++ b/src/v5/codec/decode.rs
@@ -17,8 +17,8 @@ pub(super) fn decode_packet(mut src: Bytes, first_byte: u8) -> Result<Packet, De
         packet_type::SUBACK => Ok(Packet::SubscribeAck(SubscribeAck::decode(&mut src)?)),
         packet_type::UNSUBSCRIBE => Ok(Packet::Unsubscribe(Unsubscribe::decode(&mut src)?)),
         packet_type::UNSUBACK => Ok(Packet::UnsubscribeAck(UnsubscribeAck::decode(&mut src)?)),
-        packet_type::CONNECT => Ok(Packet::Connect(Connect::decode(&mut src)?)),
-        packet_type::CONNACK => Ok(Packet::ConnectAck(ConnectAck::decode(&mut src)?)),
+        packet_type::CONNECT => Ok(Packet::Connect(Box::new(Connect::decode(&mut src)?))),
+        packet_type::CONNACK => Ok(Packet::ConnectAck(Box::new(ConnectAck::decode(&mut src)?))),
         packet_type::DISCONNECT => Ok(Packet::Disconnect(Disconnect::decode(&mut src)?)),
         packet_type::AUTH => Ok(Packet::Auth(Auth::decode(&mut src)?)),
         packet_type::PUBREC => Ok(Packet::PublishReceived(PublishAck::decode(&mut src)?)),
@@ -165,11 +165,11 @@ mod tests {
 
         assert_decode_packet(
             b"\x20\x03\x01\x86\x00",
-            Packet::ConnectAck(ConnectAck {
+            Packet::ConnectAck(Box::new(ConnectAck {
                 session_present: true,
                 reason_code: ConnectAckReason::BadUserNameOrPassword,
                 ..ConnectAck::default()
-            }),
+            })),
         );
 
         assert_decode_packet([0b1110_0000, 0], Packet::Disconnect(Disconnect::default()));
diff --git a/src/v5/codec/encode.rs b/src/v5/codec/encode.rs
index 9ed557d3..e7d96fa3 100644
--- a/src/v5/codec/encode.rs
+++ b/src/v5/codec/encode.rs
@@ -317,7 +317,7 @@ mod tests {
     #[test]
     fn test_encode_connect_packets() {
         assert_encode_packet(
-            &Packet::Connect(Connect {
+            &Packet::Connect(Box::new(Connect {
                 clean_start: false,
                 keep_alive: 60,
                 client_id: ByteString::from_static("12345"),
@@ -333,13 +333,13 @@ mod tests {
                 topic_alias_max: 0,
                 user_properties: vec![],
                 max_packet_size: None,
-            }),
+            })),
             &b"\x10\x1E\x00\x04MQTT\x05\xC0\x00\x3C\x00\x00\
 \x0512345\x00\x04user\x00\x04pass"[..],
         );
 
         assert_encode_packet(
-            &Packet::Connect(Connect {
+            &Packet::Connect(Box::new(Connect {
                 clean_start: false,
                 keep_alive: 60,
                 client_id: ByteString::from_static("12345"),
@@ -367,7 +367,7 @@ mod tests {
                 topic_alias_max: 0,
                 user_properties: vec![],
                 max_packet_size: None,
-            }),
+            })),
             &b"\x10\x23\x00\x04MQTT\x05\x14\x00\x3C\x00\x00\
 \x0512345\x00\x00\x05topic\x00\x07message"[..],
         );
diff --git a/src/v5/codec/packet/mod.rs b/src/v5/codec/packet/mod.rs
index 7180ee0a..d973dbf1 100644
--- a/src/v5/codec/packet/mod.rs
+++ b/src/v5/codec/packet/mod.rs
@@ -28,9 +28,9 @@ pub use subscribe::*;
 /// MQTT Control Packets
 pub enum Packet {
     /// Client request to connect to Server
-    Connect(Connect),
+    Connect(Box<Connect>),
     /// Connect acknowledgment
-    ConnectAck(ConnectAck),
+    ConnectAck(Box<ConnectAck>),
     /// Publish message
     Publish(Publish),
     /// Publish acknowledgment
diff --git a/src/v5/error.rs b/src/v5/error.rs
index 331f63b3..f4751be7 100644
--- a/src/v5/error.rs
+++ b/src/v5/error.rs
@@ -9,7 +9,7 @@ pub use crate::v5::codec;
 pub enum ClientError {
     /// Connect negotiation failed
     #[display(fmt = "Connect ack failed: {:?}", _0)]
-    Ack(codec::ConnectAck),
+    Ack(Box<codec::ConnectAck>),
     /// Protocol error
     #[display(fmt = "Protocol error: {:?}", _0)]
     Protocol(ProtocolError),
diff --git a/src/v5/handshake.rs b/src/v5/handshake.rs
index 4cdd1afb..892ddfa8 100644
--- a/src/v5/handshake.rs
+++ b/src/v5/handshake.rs
@@ -5,7 +5,7 @@ use super::{codec, shared::MqttShared, sink::MqttSink};
 /// Handshake message
 pub struct Handshake<Io> {
     io: Io,
-    pkt: codec::Connect,
+    pkt: Box<codec::Connect>,
     pub(super) shared: Rc<MqttShared>,
     pub(super) max_size: u32,
     pub(super) max_receive: u16,
@@ -14,7 +14,7 @@ pub struct Handshake<Io> {
 
 impl<Io> Handshake<Io> {
     pub(crate) fn new(
-        pkt: codec::Connect,
+        pkt: Box<codec::Connect>,
         io: Io,
         shared: Rc<MqttShared>,
         max_size: u32,
diff --git a/src/v5/server.rs b/src/v5/server.rs
index d7f673e3..343f072a 100644
--- a/src/v5/server.rs
+++ b/src/v5/server.rs
@@ -497,7 +497,11 @@ where
 
                     state.set_buffer_params(ack.read_hw, ack.write_hw, ack.lw);
                     state
-                        .send(&mut ack.io, &shared.codec, mqtt::Packet::ConnectAck(ack.packet))
+                        .send(
+                            &mut ack.io,
+                            &shared.codec,
+                            mqtt::Packet::ConnectAck(Box::new(ack.packet)),
+                        )
                         .await?;
 
                     Ok((
@@ -521,7 +525,10 @@ where
                             .shared
                             .state
                             .write()
-                            .encode(mqtt::Packet::ConnectAck(ack.packet), &ack.shared.codec)
+                            .encode(
+                                mqtt::Packet::ConnectAck(Box::new(ack.packet)),
+                                &ack.shared.codec,
+                            )
                             .is_ok()
                     {
                         WriteTask::shutdown(
@@ -743,7 +750,7 @@ where
                             .send(
                                 &mut ack.io,
                                 &shared.codec,
-                                mqtt::Packet::ConnectAck(ack.packet),
+                                mqtt::Packet::ConnectAck(Box::new(ack.packet)),
                             )
                             .await?;
 
@@ -770,7 +777,10 @@ where
                                 .shared
                                 .state
                                 .write()
-                                .encode(mqtt::Packet::ConnectAck(ack.packet), &ack.shared.codec)
+                                .encode(
+                                    mqtt::Packet::ConnectAck(Box::new(ack.packet)),
+                                    &ack.shared.codec,
+                                )
                                 .is_ok()
                         {
                             WriteTask::shutdown(
diff --git a/tests/test_server.rs b/tests/test_server.rs
index 3080c0a6..27b11e79 100644
--- a/tests/test_server.rs
+++ b/tests/test_server.rs
@@ -123,7 +123,7 @@ async fn test_ping() -> std::io::Result<()> {
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
     framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
+        .send(codec::Packet::Connect(codec::Connect::default().client_id("user").into()))
         .await
         .unwrap();
     framed.next().await.unwrap().unwrap();
@@ -157,10 +157,7 @@ async fn test_ack_order() -> std::io::Result<()> {
 
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
-    framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
-        .await
-        .unwrap();
+    framed.send(codec::Connect::default().client_id("user").into()).await.unwrap();
     let _ = framed.next().await.unwrap().unwrap();
 
     framed
@@ -306,7 +303,7 @@ async fn test_handle_incoming() -> std::io::Result<()> {
 
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
-    framed.write(codec::Packet::Connect(codec::Connect::default().client_id("user"))).unwrap();
+    framed.write(codec::Connect::default().client_id("user").into()).unwrap();
     framed
         .write(
             codec::Publish {
diff --git a/tests/test_server_v5.rs b/tests/test_server_v5.rs
index fbd6fe2b..99bcc718 100644
--- a/tests/test_server_v5.rs
+++ b/tests/test_server_v5.rs
@@ -160,7 +160,7 @@ async fn test_ping() -> std::io::Result<()> {
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::new());
     framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
+        .send(codec::Packet::Connect(Box::new(codec::Connect::default().client_id("user"))))
         .await
         .unwrap();
     let _ = framed.next().await.unwrap().unwrap();
@@ -197,7 +197,7 @@ async fn test_ack_order() -> std::io::Result<()> {
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
     framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
+        .send(codec::Packet::Connect(Box::new(codec::Connect::default().client_id("user"))))
         .await
         .unwrap();
     let _ = framed.next().await.unwrap().unwrap();
@@ -268,9 +268,9 @@ async fn test_dups() {
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
     framed
-        .send(codec::Packet::Connect(
+        .send(codec::Packet::Connect(Box::new(
             codec::Connect::default().client_id("user").receive_max(2),
-        ))
+        )))
         .await
         .unwrap();
     let _ = framed.next().await.unwrap().unwrap();
@@ -385,19 +385,19 @@ async fn test_max_receive() {
     let mut framed = Framed::new(io, codec::Codec::default());
 
     framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
+        .send(codec::Packet::Connect(Box::new(codec::Connect::default().client_id("user"))))
         .await
         .unwrap();
     let ack = framed.next().await.unwrap().unwrap();
     assert_eq!(
         ack,
-        codec::Packet::ConnectAck(codec::ConnectAck {
+        codec::Packet::ConnectAck(Box::new(codec::ConnectAck {
             receive_max: Some(NonZeroU16::new(1).unwrap()),
             max_qos: Some(codec::QoS::AtLeastOnce),
             reason_code: codec::ConnectAckReason::Success,
             topic_alias_max: 32,
             ..Default::default()
-        })
+        }))
     );
 
     framed
@@ -657,7 +657,7 @@ async fn test_suback_with_reason() -> std::io::Result<()> {
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::new());
     framed
-        .send(codec::Packet::Connect(codec::Connect::default().client_id("user")))
+        .send(codec::Packet::Connect(Box::new(codec::Connect::default().client_id("user"))))
         .await
         .unwrap();
     let _ = framed.next().await.unwrap().unwrap();
@@ -720,7 +720,9 @@ async fn test_handle_incoming() -> std::io::Result<()> {
 
     let io = srv.connect().await.unwrap();
     let mut framed = Framed::new(io, codec::Codec::default());
-    framed.write(codec::Packet::Connect(codec::Connect::default().client_id("user"))).unwrap();
+    framed
+        .write(codec::Packet::Connect(Box::new(codec::Connect::default().client_id("user"))))
+        .unwrap();
     framed.write(pkt_publish().into()).unwrap();
     framed
         .write(codec::Packet::Disconnect(codec::Disconnect {