diff --git a/clients/client-core/src/client/cover_traffic_stream.rs b/clients/client-core/src/client/cover_traffic_stream.rs
index 3883f63b33..f13cbde3fa 100644
--- a/clients/client-core/src/client/cover_traffic_stream.rs
+++ b/clients/client-core/src/client/cover_traffic_stream.rs
@@ -10,6 +10,7 @@ use log::*;
 use nymsphinx::acknowledgements::AckKey;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::cover::generate_loop_cover_packet;
+use nymsphinx::params::PacketSize;
 use nymsphinx::utils::sample_poisson_duration;
 use rand::{rngs::OsRng, CryptoRng, Rng};
 use std::pin::Pin;
@@ -58,6 +59,9 @@ where
 
     /// Accessor to the common instance of network topology.
     topology_access: TopologyAccessor,
+
+    /// Predefined packet size used for the loop cover messages.
+    packet_size: PacketSize,
 }
 
 impl<R> Stream for LoopCoverTrafficStream<R>
@@ -130,9 +134,14 @@ impl LoopCoverTrafficStream<OsRng> {
             our_full_destination,
             rng,
             topology_access,
+            packet_size: Default::default(),
         }
     }
 
+    pub fn set_custom_packet_size(&mut self, packet_size: PacketSize) {
+        self.packet_size = packet_size;
+    }
+
     async fn on_new_message(&mut self) {
         trace!("next cover message!");
 
@@ -158,6 +167,7 @@ impl LoopCoverTrafficStream<OsRng> {
             &self.our_full_destination,
             self.average_ack_delay,
             self.average_packet_delay,
+            self.packet_size,
         )
         .expect("Somehow failed to generate a loop cover message with a valid topology");
 
diff --git a/clients/client-core/src/client/real_messages_control/acknowledgement_control/mod.rs b/clients/client-core/src/client/real_messages_control/acknowledgement_control/mod.rs
index c875ffbfce..c946716091 100644
--- a/clients/client-core/src/client/real_messages_control/acknowledgement_control/mod.rs
+++ b/clients/client-core/src/client/real_messages_control/acknowledgement_control/mod.rs
@@ -13,6 +13,7 @@ use crate::spawn_future;
 use futures::channel::mpsc;
 use gateway_client::AcknowledgementReceiver;
 use log::*;
+use nymsphinx::params::PacketSize;
 use nymsphinx::{
     acknowledgements::AckKey,
     addressing::clients::Recipient,
@@ -121,6 +122,9 @@ pub(super) struct Config {
 
     /// Average delay a data packet is going to get delayed at a single mixnode.
     average_packet_delay: Duration,
+
+    /// Predefined packet size used for the encapsulated messages.
+    packet_size: PacketSize,
 }
 
 impl Config {
@@ -135,8 +139,14 @@ impl Config {
             ack_wait_multiplier,
             average_ack_delay,
             average_packet_delay,
+            packet_size: Default::default(),
         }
     }
+
+    pub fn with_custom_packet_size(mut self, packet_size: PacketSize) -> Self {
+        self.packet_size = packet_size;
+        self
+    }
 }
 
 pub(super) struct AcknowledgementController<R>
@@ -176,7 +186,8 @@ where
             ack_recipient,
             config.average_packet_delay,
             config.average_ack_delay,
-        );
+        )
+        .with_custom_real_message_packet_size(config.packet_size);
 
         // will listen for any acks coming from the network
         let acknowledgement_listener = AcknowledgementListener::new(
diff --git a/clients/client-core/src/client/real_messages_control/mod.rs b/clients/client-core/src/client/real_messages_control/mod.rs
index 129176528d..d97e27bdc3 100644
--- a/clients/client-core/src/client/real_messages_control/mod.rs
+++ b/clients/client-core/src/client/real_messages_control/mod.rs
@@ -19,6 +19,7 @@ use gateway_client::AcknowledgementReceiver;
 use log::*;
 use nymsphinx::acknowledgements::AckKey;
 use nymsphinx::addressing::clients::Recipient;
+use nymsphinx::params::PacketSize;
 use rand::{rngs::OsRng, CryptoRng, Rng};
 use std::sync::Arc;
 use std::time::Duration;
@@ -55,6 +56,9 @@ pub struct Config {
     /// Controls whether the main packet stream constantly produces packets according to the predefined
     /// poisson distribution.
     disable_main_poisson_packet_distribution: bool,
+
+    /// Predefined packet size used for the encapsulated messages.
+    packet_size: PacketSize,
 }
 
 impl Config {
@@ -79,8 +83,13 @@ impl Config {
             average_packet_delay_duration,
             average_ack_delay_duration,
             disable_main_poisson_packet_distribution,
+            packet_size: Default::default(),
         }
     }
+
+    pub fn set_custom_packet_size(&mut self, packet_size: PacketSize) {
+        self.packet_size = packet_size;
+    }
 }
 
 pub struct RealMessagesController<R>
@@ -119,7 +128,8 @@ impl RealMessagesController<OsRng> {
             config.ack_wait_multiplier,
             config.average_ack_delay_duration,
             config.average_packet_delay_duration,
-        );
+        )
+        .with_custom_packet_size(config.packet_size);
 
         let ack_control = AcknowledgementController::new(
             ack_control_config,
@@ -137,7 +147,8 @@ impl RealMessagesController<OsRng> {
             config.average_packet_delay_duration,
             config.average_message_sending_delay,
             config.disable_main_poisson_packet_distribution,
-        );
+        )
+        .with_custom_cover_packet_size(config.packet_size);
 
         let out_queue_control = OutQueueControl::new(
             out_queue_config,
diff --git a/clients/client-core/src/client/real_messages_control/real_traffic_stream.rs b/clients/client-core/src/client/real_messages_control/real_traffic_stream.rs
index 2a72173846..2041d0169c 100644
--- a/clients/client-core/src/client/real_messages_control/real_traffic_stream.rs
+++ b/clients/client-core/src/client/real_messages_control/real_traffic_stream.rs
@@ -22,6 +22,7 @@ use std::time::Duration;
 
 #[cfg(not(target_arch = "wasm32"))]
 use tokio::time;
+use nymsphinx::params::PacketSize;
 
 #[cfg(target_arch = "wasm32")]
 use wasm_timer;
@@ -40,6 +41,9 @@ pub(crate) struct Config {
     /// Controls whether the stream constantly produces packets according to the predefined
     /// poisson distribution.
     disable_poisson_packet_distribution: bool,
+
+    /// Predefined packet size used for the loop cover messages.
+    cover_packet_size: PacketSize,
 }
 
 impl Config {
@@ -54,8 +58,14 @@ impl Config {
             average_packet_delay,
             average_message_sending_delay,
             disable_poisson_packet_distribution,
+            cover_packet_size: Default::default()
         }
     }
+
+    pub fn with_custom_cover_packet_size(mut self, packet_size: PacketSize) -> Self {
+        self.cover_packet_size = packet_size;
+        self
+    }
 }
 
 pub(crate) struct OutQueueControl<R>
@@ -192,6 +202,7 @@ where
                     &self.our_full_destination,
                     self.config.average_ack_delay,
                     self.config.average_packet_delay,
+                    self.config.cover_packet_size,
                 )
                 .expect("Somehow failed to generate a loop cover message with a valid topology")
             }
diff --git a/clients/client-core/src/config/mod.rs b/clients/client-core/src/config/mod.rs
index 4aca05ba6f..f25da56604 100644
--- a/clients/client-core/src/config/mod.rs
+++ b/clients/client-core/src/config/mod.rs
@@ -247,6 +247,10 @@ impl<T: NymConfig> Config<T> {
         self.debug.disable_main_poisson_packet_distribution
     }
 
+    pub fn get_use_extended_packet_size(&self) -> bool {
+        self.debug.use_extended_packet_size
+    }
+
     pub fn get_version(&self) -> &str {
         &self.client.version
     }
@@ -465,6 +469,9 @@ pub struct Debug {
     /// Controls whether the main packet stream constantly produces packets according to the predefined
     /// poisson distribution.
     pub disable_main_poisson_packet_distribution: bool,
+
+    /// Controls whether the sent sphinx packet use the NON-DEFAULT bigger size.
+    pub use_extended_packet_size: bool,
 }
 
 impl Default for Debug {
@@ -481,6 +488,7 @@ impl Default for Debug {
             topology_resolution_timeout: DEFAULT_TOPOLOGY_RESOLUTION_TIMEOUT,
             disable_loop_cover_traffic_stream: false,
             disable_main_poisson_packet_distribution: false,
+            use_extended_packet_size: false
         }
     }
 }
diff --git a/clients/native/src/client/mod.rs b/clients/native/src/client/mod.rs
index c994b9c3c0..38f3d083a0 100644
--- a/clients/native/src/client/mod.rs
+++ b/clients/native/src/client/mod.rs
@@ -31,6 +31,7 @@ use log::*;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use nymsphinx::anonymous_replies::ReplySurb;
+use nymsphinx::params::PacketSize;
 use nymsphinx::receiver::ReconstructedMessage;
 use task::{wait_for_signal, ShutdownListener, ShutdownNotifier};
 
@@ -90,7 +91,7 @@ impl NymClient {
     ) {
         info!("Starting loop cover traffic stream...");
 
-        LoopCoverTrafficStream::new(
+        let mut stream = LoopCoverTrafficStream::new(
             self.key_manager.ack_key(),
             self.config.get_base().get_average_ack_delay(),
             self.config.get_base().get_average_packet_delay(),
@@ -100,8 +101,13 @@ impl NymClient {
             mix_tx,
             self.as_mix_recipient(),
             topology_accessor,
-        )
-        .start_with_shutdown(shutdown);
+        );
+
+        if self.config.get_base().get_use_extended_packet_size() {
+            stream.set_custom_packet_size(PacketSize::ExtendedPacket)
+        }
+
+        stream.start_with_shutdown(shutdown);
     }
 
     fn start_real_traffic_controller(
@@ -113,7 +119,7 @@ impl NymClient {
         mix_sender: BatchMixMessageSender,
         shutdown: ShutdownListener,
     ) {
-        let controller_config = real_messages_control::Config::new(
+        let mut controller_config = real_messages_control::Config::new(
             self.key_manager.ack_key(),
             self.config.get_base().get_ack_wait_multiplier(),
             self.config.get_base().get_ack_wait_addition(),
@@ -126,6 +132,10 @@ impl NymClient {
             self.as_mix_recipient(),
         );
 
+        if self.config.get_base().get_use_extended_packet_size() {
+            controller_config.set_custom_packet_size(PacketSize::ExtendedPacket)
+        }
+
         info!("Starting real traffic stream...");
 
         RealMessagesController::new(
diff --git a/clients/socks5/src/client/mod.rs b/clients/socks5/src/client/mod.rs
index 43ed57b141..1110f88536 100644
--- a/clients/socks5/src/client/mod.rs
+++ b/clients/socks5/src/client/mod.rs
@@ -31,6 +31,7 @@ use gateway_client::{
 use log::*;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
+use nymsphinx::params::PacketSize;
 use task::{wait_for_signal, ShutdownListener, ShutdownNotifier};
 
 use crate::client::config::Config;
@@ -91,7 +92,7 @@ impl NymClient {
     ) {
         info!("Starting loop cover traffic stream...");
 
-        LoopCoverTrafficStream::new(
+        let mut stream = LoopCoverTrafficStream::new(
             self.key_manager.ack_key(),
             self.config.get_base().get_average_ack_delay(),
             self.config.get_base().get_average_packet_delay(),
@@ -101,8 +102,13 @@ impl NymClient {
             mix_tx,
             self.as_mix_recipient(),
             topology_accessor,
-        )
-        .start_with_shutdown(shutdown);
+        );
+
+        if self.config.get_base().get_use_extended_packet_size() {
+            stream.set_custom_packet_size(PacketSize::ExtendedPacket)
+        }
+
+        stream.start_with_shutdown(shutdown);
     }
 
     fn start_real_traffic_controller(
@@ -114,7 +120,7 @@ impl NymClient {
         mix_sender: BatchMixMessageSender,
         shutdown: ShutdownListener,
     ) {
-        let controller_config = client_core::client::real_messages_control::Config::new(
+        let mut controller_config = client_core::client::real_messages_control::Config::new(
             self.key_manager.ack_key(),
             self.config.get_base().get_ack_wait_multiplier(),
             self.config.get_base().get_ack_wait_addition(),
@@ -127,6 +133,10 @@ impl NymClient {
             self.as_mix_recipient(),
         );
 
+        if self.config.get_base().get_use_extended_packet_size() {
+            controller_config.set_custom_packet_size(PacketSize::ExtendedPacket)
+        }
+
         info!("Starting real traffic stream...");
 
         RealMessagesController::new(
diff --git a/common/nymsphinx/cover/src/lib.rs b/common/nymsphinx/cover/src/lib.rs
index 3a545dbaa0..c7ab32d8c1 100644
--- a/common/nymsphinx/cover/src/lib.rs
+++ b/common/nymsphinx/cover/src/lib.rs
@@ -76,6 +76,7 @@ pub fn generate_loop_cover_packet<R>(
     full_address: &Recipient,
     average_ack_delay: time::Duration,
     average_packet_delay: time::Duration,
+    packet_size: PacketSize,
 ) -> Result<MixPacket, CoverMessageError>
 where
     R: RngCore + CryptoRng,
@@ -96,7 +97,7 @@ where
 
     let public_key_bytes = ephemeral_keypair.public_key().to_bytes();
     let cover_size =
-        PacketSize::default().plaintext_size() - public_key_bytes.len() - ack_bytes.len();
+        packet_size.plaintext_size() - public_key_bytes.len() - ack_bytes.len();
 
     let mut cover_content: Vec<_> = LOOP_COVER_MESSAGE_PAYLOAD
         .iter()
@@ -129,7 +130,7 @@ where
 
     // once merged, that's an easy rng injection point for sphinx packets : )
     let packet = SphinxPacketBuilder::new()
-        .with_payload_size(PacketSize::default().payload_size())
+        .with_payload_size(packet_size.payload_size())
         .build_packet(packet_payload, &route, &destination, &delays)
         .unwrap();
 
diff --git a/common/nymsphinx/src/preparer/mod.rs b/common/nymsphinx/src/preparer/mod.rs
index 79fc778da0..d91a7c85a5 100644
--- a/common/nymsphinx/src/preparer/mod.rs
+++ b/common/nymsphinx/src/preparer/mod.rs
@@ -105,7 +105,7 @@ where
     }
 
     /// Allows setting non-default size of the sphinx packets sent out.
-    pub fn with_packet_size(mut self, packet_size: PacketSize) -> Self {
+    pub fn with_custom_real_message_packet_size(mut self, packet_size: PacketSize) -> Self {
         self.packet_size = packet_size;
         self
     }