Inventory?

Hey, i am looking for a inventory addon or swep or something like that, that would work in sandbox.

Something that can, for example hold ANY kind of entity and prop, but i’ve been looking around all over Garrysmod.org and i’ve only really found this backpack swep
http://www.garrysmod.org/downloads/?a=view&id=118284

It works… But it is extremely buggy for clients… Basically after a while you will get your whole inventory wiped from it. Which is pretty god damn annoying.

But would anyone know where i can find what im looking for.
(Also don’t say Itemforge or any thing inventory thing that comes with items. We have all the items/equipment we need.)

http://www.facepunch.com/threads/955706