Lumber pack frames and back packs - how do I store items in them?
Currently you can't due to code limits. The pack frame is primarily there as a role-play justification for carrying lots of different things. Ideally it would make it easier but it can't with the current modding code.
Some items may be containers like sacks and a if you "a" apply them you can put berries etc in them. Their code also has a limit to a single type of material going in.
There is a sled wagon thing, forget the name, that converts heavy tree trunks or logs into tokens. Then in the presecence of the sled wagon you can use another mod line to turn them back into the tree trunks. This was one of the other community members wonderful idea that made it much more possible to move 100s upon 100s of wood for buidling cabins. In this way weight is better handled but it takes 2 craft recipes, one to convert to the low weight token and the second to convert back to the normal full weight object.