Hey Osage,
I'll tell you I do with those things. It might not be the best method, but it's work for me so far.
Feather--in the freezer, usually with them still attached to the wing (not the best method), until I need them or they're taking up too much room in the freeze. Then I pull them out, hang a mesh bag to dry, cutting them from the wing if needed. When dry I put them in a 1 1/2 gallon freezer to store them in a cabinet in the workshop.
Snake skins are rolled up, place in a freezer bag then in the freezer.
Sinew and hide glue in freezer bags then in a plastic tool box.
Rawhide and leather and fur are rolled up and tied then placed in a plastic container like the ones you store sweaters in under your bed.