diff --git a/crates/librqbit/src/storage/mod.rs b/crates/librqbit/src/storage/mod.rs
index 7a65bfb..a557617 100644
--- a/crates/librqbit/src/storage/mod.rs
+++ b/crates/librqbit/src/storage/mod.rs
@@ -12,6 +12,12 @@ pub trait StorageFactory: Send + Sync + Any {
     fn init_storage(&self, info: &ManagedTorrentInfo) -> anyhow::Result<Box<dyn TorrentStorage>>;
 }
 
+impl<U: StorageFactory + ?Sized> StorageFactory for Box<U> {
+    fn init_storage(&self, info: &ManagedTorrentInfo) -> anyhow::Result<Box<dyn TorrentStorage>> {
+        (**self).init_storage(info)
+    }
+}
+
 pub trait TorrentStorage: Send + Sync {
     fn pread_exact(&self, file_id: usize, offset: u64, buf: &mut [u8]) -> anyhow::Result<()>;
 
@@ -23,3 +29,25 @@ pub trait TorrentStorage: Send + Sync {
 
     fn take(&self) -> anyhow::Result<Box<dyn TorrentStorage>>;
 }
+
+impl<U: TorrentStorage + ?Sized> TorrentStorage for Box<U> {
+    fn pread_exact(&self, file_id: usize, offset: u64, buf: &mut [u8]) -> anyhow::Result<()> {
+        (**self).pread_exact(file_id, offset, buf)
+    }
+
+    fn pwrite_all(&self, file_id: usize, offset: u64, buf: &[u8]) -> anyhow::Result<()> {
+        (**self).pwrite_all(file_id, offset, buf)
+    }
+
+    fn remove_file(&self, file_id: usize, filename: &Path) -> anyhow::Result<()> {
+        (**self).remove_file(file_id, filename)
+    }
+
+    fn ensure_file_length(&self, file_id: usize, length: u64) -> anyhow::Result<()> {
+        (**self).ensure_file_length(file_id, length)
+    }
+
+    fn take(&self) -> anyhow::Result<Box<dyn TorrentStorage>> {
+        (**self).take()
+    }
+}
diff --git a/crates/librqbit/src/storage/slow.rs b/crates/librqbit/src/storage/slow.rs
index b06b2f4..e822d7b 100644
--- a/crates/librqbit/src/storage/slow.rs
+++ b/crates/librqbit/src/storage/slow.rs
@@ -4,19 +4,19 @@ use rand::Rng;
 
 use super::{StorageFactory, TorrentStorage};
 
-pub struct SlowStorageFactory {
-    underlying_factory: Box<dyn StorageFactory>,
+pub struct SlowStorageFactory<U> {
+    underlying_factory: U,
 }
 
-impl SlowStorageFactory {
-    pub fn new(underlying: Box<dyn StorageFactory>) -> Self {
+impl<U: StorageFactory> SlowStorageFactory<U> {
+    pub fn new(underlying: U) -> Self {
         Self {
             underlying_factory: underlying,
         }
     }
 }
 
-impl StorageFactory for SlowStorageFactory {
+impl<U: StorageFactory> StorageFactory for SlowStorageFactory<U> {
     fn init_storage(
         &self,
         info: &crate::ManagedTorrentInfo,
@@ -27,8 +27,8 @@ impl StorageFactory for SlowStorageFactory {
     }
 }
 
-struct SlowStorage {
-    underlying: Box<dyn TorrentStorage>,
+struct SlowStorage<U> {
+    underlying: U,
 }
 
 fn random_sleep() {
@@ -38,7 +38,7 @@ fn random_sleep() {
     std::thread::sleep(sl)
 }
 
-impl TorrentStorage for SlowStorage {
+impl<U: TorrentStorage> TorrentStorage for SlowStorage<U> {
     fn pread_exact(&self, file_id: usize, offset: u64, buf: &mut [u8]) -> anyhow::Result<()> {
         random_sleep();
         self.underlying.pread_exact(file_id, offset, buf)
@@ -58,7 +58,7 @@ impl TorrentStorage for SlowStorage {
     }
 
     fn take(&self) -> anyhow::Result<Box<dyn TorrentStorage>> {
-        Ok(Box::new(Self {
+        Ok(Box::new(SlowStorage {
             underlying: self.underlying.take()?,
         }))
     }
diff --git a/crates/librqbit/src/storage/timing.rs b/crates/librqbit/src/storage/timing.rs
index db50745..b3cf7cd 100644
--- a/crates/librqbit/src/storage/timing.rs
+++ b/crates/librqbit/src/storage/timing.rs
@@ -1,12 +1,12 @@
 use super::{StorageFactory, TorrentStorage};
 
-pub struct TimingStorageFactory {
+pub struct TimingStorageFactory<U> {
     name: String,
-    underlying_factory: Box<dyn StorageFactory>,
+    underlying_factory: U,
 }
 
-impl TimingStorageFactory {
-    pub fn new(name: String, underlying: Box<dyn StorageFactory>) -> Self {
+impl<U> TimingStorageFactory<U> {
+    pub fn new(name: String, underlying: U) -> Self {
         Self {
             name,
             underlying_factory: underlying,
@@ -14,7 +14,7 @@ impl TimingStorageFactory {
     }
 }
 
-impl StorageFactory for TimingStorageFactory {
+impl<U: StorageFactory> StorageFactory for TimingStorageFactory<U> {
     fn init_storage(
         &self,
         info: &crate::ManagedTorrentInfo,
@@ -26,9 +26,9 @@ impl StorageFactory for TimingStorageFactory {
     }
 }
 
-struct TimingStorage {
+struct TimingStorage<U> {
     name: String,
-    underlying: Box<dyn TorrentStorage>,
+    underlying: U,
 }
 
 macro_rules! timeit {
@@ -43,7 +43,7 @@ macro_rules! timeit {
     };
 }
 
-impl TorrentStorage for TimingStorage {
+impl<U: TorrentStorage> TorrentStorage for TimingStorage<U> {
     fn pread_exact(&self, file_id: usize, offset: u64, buf: &mut [u8]) -> anyhow::Result<()> {
         let storage = &self.name;
         let len = buf.len();
@@ -79,7 +79,7 @@ impl TorrentStorage for TimingStorage {
     }
 
     fn take(&self) -> anyhow::Result<Box<dyn TorrentStorage>> {
-        Ok(Box::new(Self {
+        Ok(Box::new(TimingStorage {
             underlying: self.underlying.take()?,
             name: self.name.clone(),
         }))