diff --git a/src/bipack_source.rs b/src/bipack_source.rs
index c22151f..22383e5 100644
--- a/src/bipack_source.rs
+++ b/src/bipack_source.rs
@@ -188,32 +188,7 @@ impl<'x> BipackSource for SliceSource<'x> {
     }
 }
 
-pub struct VecSource {
-    data: Vec<u8>,
-    position: usize,
-}
-
-impl VecSource {
-    pub fn from(src: Vec<u8>) -> VecSource {
-        VecSource { data: src, position: 0 }
-    }
-}
-
-impl BipackSource for VecSource {
-    fn get_u8(self: &mut Self) -> Result<u8> {
-        if self.position >= self.data.len() {
-            Err(NoDataError)
-        } else {
-            let result = self.data[self.position];
-            self.position += 1;
-            Ok(result)
-        }
-    }
-
-    fn eof(self: &Self) -> bool {
-        self.data.len() <= self.position
-    }
-}
+
 
 
 
diff --git a/src/ser.rs b/src/ser.rs
index 45cf01f..82c58d9 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -3,9 +3,9 @@ use serde::{ser, Serialize};
 use crate::bipack_sink::{BipackSink, IntoU64};
 use crate::error::{Error, Result};
 
-pub struct Serializer {
+pub struct Serializer<S: BipackSink> {
     // This string starts empty and JSON is appended as values are serialized.
-    output: Vec<u8>,
+    output: S,
 }
 
 pub fn to_bytes<T>(value: &T) -> Result<Vec<u8>>
@@ -16,7 +16,7 @@ pub fn to_bytes<T>(value: &T) -> Result<Vec<u8>>
     Ok(serializer.output)
 }
 
-impl<'a> ser::Serializer for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::Serializer for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
     type SerializeSeq = Self;
@@ -202,7 +202,7 @@ impl<'a> ser::Serializer for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeSeq for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeSeq for &'a mut Serializer<S> {
     // Must match the `Ok` type of the serializer.
     type Ok = ();
     // Must match the `Error` type of the serializer.
@@ -222,7 +222,7 @@ impl<'a> ser::SerializeSeq for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeTuple for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeTuple for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
 
@@ -238,7 +238,7 @@ impl<'a> ser::SerializeTuple for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeTupleStruct for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeTupleStruct for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
 
@@ -254,7 +254,7 @@ impl<'a> ser::SerializeTupleStruct for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeTupleVariant for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeTupleVariant for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
 
@@ -270,7 +270,7 @@ impl<'a> ser::SerializeTupleVariant for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeMap for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeMap for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
 
@@ -306,7 +306,7 @@ impl<'a> ser::SerializeMap for &'a mut Serializer {
 
 // Structs are like maps in which the keys are constrained to be compile-time
 // constant strings.
-impl<'a> ser::SerializeStruct for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeStruct for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;
 
@@ -322,7 +322,7 @@ impl<'a> ser::SerializeStruct for &'a mut Serializer {
     }
 }
 
-impl<'a> ser::SerializeStructVariant for &'a mut Serializer {
+impl<'a, S: BipackSink> ser::SerializeStructVariant for &'a mut Serializer<S> {
     type Ok = ();
     type Error = Error;