is there a backpack or a similar item in the game that can be used to increase inventory space?

if not then that would be a good addition to the game, could have different tiers of backpack with the first tier being leather and scraps and then troll hide and then wolf hide or something, or maybe something you can buy from the trader, like the meginjord but instead of weight capacity it could be inventory space. just a suggestion I would like to see.

(another thing is achievements, I would love achievements in this game, a points shop would be cool too)