In the Homo Sapiens Mode if trying to play -10 degree Icy starting climate without leaving the area is annoying to impossible. Dont need cattails for handheld storage but at least things like sticks, stones. flint should be stackable on the ground in piles similar to logs, peat, coal etc similarly for dry grass although not as important to maybe stack them like coal?
for portable storage a limited 2 slot bag/pouch from rwa hide or pelts would sufficient.
Other Idea is being able to hang raw hide on the walls not jus the floor since clay is very hard to come by. this is primarily to help Homo Sapiens survival runs although would be useful for the others too