diff --git a/Cargo.toml b/Cargo.toml
index 7662640..af3eba5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,4 +27,4 @@ webbrowser = { version = "0.6.0", optional = true }
 ansi_term = "0.12.1"
 cpal = { version = "0.13.5", optional = true }
 rubato = { version = "0.11.0", optional = true }
-winapi = { version = "0.3.9", features = ["timeapi"], optional = true }
\ No newline at end of file
+winapi = { version = "0.3.9", features = ["timeapi"], optional = true }
diff --git a/src/main.rs b/src/main.rs
index 99f2f8f..efa686b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -164,7 +164,10 @@ fn load_cart(filename: &Path, config: &Config) -> (Result<Vec<u8>>, Vec<PathBuf>
 
         if let Some(ref pack_config) = config.pack {
             cart = uw8_tool::pack(&cart, pack_config)?;
-            println!("packed size: {} bytes", cart.len());
+            println!(
+                "\npacked size: {:.2} bytes",
+                uw8_tool::compressed_size(&cart)
+            );
         }
 
         if let Some(ref path) = config.output_path {
diff --git a/uw8-tool/Cargo.lock b/uw8-tool/Cargo.lock
index 780032b..3bd1117 100644
--- a/uw8-tool/Cargo.lock
+++ b/uw8-tool/Cargo.lock
@@ -189,7 +189,7 @@ checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 [[package]]
 name = "upkr"
 version = "0.1.0"
-source = "git+https://github.com/exoticorn/upkr.git?rev=2e7983fc#2e7983fc650788d98da2eecef2d16f63e849e4a0"
+source = "git+https://github.com/exoticorn/upkr.git?rev=d93aec186c9fb91d962c488682a2db125c61306c#d93aec186c9fb91d962c488682a2db125c61306c"
 dependencies = [
  "anyhow",
  "cdivsufsort",
diff --git a/uw8-tool/Cargo.toml b/uw8-tool/Cargo.toml
index ee75be9..ec7d252 100644
--- a/uw8-tool/Cargo.toml
+++ b/uw8-tool/Cargo.toml
@@ -11,5 +11,5 @@ wasm-encoder = "0.8"
 walrus = "0.19"
 anyhow = "1"
 pico-args = "0.4"
-upkr = { git = "https://github.com/exoticorn/upkr.git", rev = "2e7983fc" }
+upkr = { git = "https://github.com/exoticorn/upkr.git", rev = "d93aec186c9fb91d962c488682a2db125c61306c" }
 pbr = "1"
\ No newline at end of file
diff --git a/uw8-tool/src/base_module.rs b/uw8-tool/src/base_module.rs
index 1e3a29c..f6e0816 100644
--- a/uw8-tool/src/base_module.rs
+++ b/uw8-tool/src/base_module.rs
@@ -286,7 +286,7 @@ impl BaseModule {
 
     pub fn create_binary(path: &Path) -> Result<()> {
         let base1 = BaseModule::for_format_version(1)?.to_wasm();
-        let data = upkr::pack(&base1, 4, None);
+        let data = upkr::pack(&base1, 4, false, None);
         File::create(path)?.write_all(&data)?;
         Ok(())
     }
diff --git a/uw8-tool/src/lib.rs b/uw8-tool/src/lib.rs
index e3fd271..b5ab0e6 100644
--- a/uw8-tool/src/lib.rs
+++ b/uw8-tool/src/lib.rs
@@ -1,7 +1,15 @@
 mod base_module;
-mod pack;
 mod filter_exports;
+mod pack;
 
 pub use base_module::BaseModule;
-pub use pack::{pack, pack_file, unpack, unpack_file, PackConfig};
 pub use filter_exports::filter_exports;
+pub use pack::{pack, pack_file, unpack, unpack_file, PackConfig};
+
+pub fn compressed_size(cart: &[u8]) -> f32 {
+    if cart[0] != 2 {
+        cart.len() as f32
+    } else {
+        upkr::compressed_size(&cart[1..]) + 1.
+    }
+}
diff --git a/uw8-tool/src/pack.rs b/uw8-tool/src/pack.rs
index 22fdd7b..640bb00 100644
--- a/uw8-tool/src/pack.rs
+++ b/uw8-tool/src/pack.rs
@@ -63,6 +63,7 @@ pub fn pack(data: &[u8], config: &PackConfig) -> Result<Vec<u8>> {
         uw8.extend_from_slice(&upkr::pack(
             &result[8..],
             level,
+            false,
             Some(&mut |pos| {
                 pb.set(pos as u64);
             }),
@@ -89,7 +90,7 @@ pub fn unpack(data: Vec<u8>) -> Result<Vec<u8>> {
     let (version, data) = match data[0] {
         0 => return Ok(data),
         1 => (1, data[1..].to_vec()),
-        2 => (1, upkr::unpack(&data[1..])),
+        2 => (1, upkr::unpack(&data[1..], false)),
         other => bail!("Uknown format version {}", other),
     };