How to serialize/deserialise with messagePack

Hi
I was falowing this tutorial:

It works fine,
But I've read the coments and one person suggests to not use BinaryFormatter, instead to use protobuf or messagepack.
I was trying messagePack.

The only two funcions that use BinaryFormatter are these two funcions:

Code (CSharp):

1.     byte[] CreateBytes() {
2.         BinaryFormatter formatter = new BinaryFormatter();
3.         using (MemoryStream ms = new MemoryStream())
4.         {
5.             formatter.Serialize(ms, this.Packages);
6.             return ms.ToArray();
7.         }
8.     }
9.  
10.     List<T> ReadBytes(byte[] bytes)
11.     {
12.         BinaryFormatter formatter = new BinaryFormatter();
13.         using (MemoryStream ms = new MemoryStream())
14.         {
15.             ms.Write(bytes, 0, bytes.Length);
16.             ms.Seek(0, SeekOrigin.Begin);
17.             return (List<T>)formatter.Deserialize(ms);
18.         }

And I'm having trouble making this work.
Any suggestions.
(Feel free to ask for code of this project)