VampireCake
Farmer
It would be really useful to be able to upgrade the backpack one more time or have an extra, additional small bag (eg a belt pouch) somewhere in late game. For things like Skull Cave runs, there are a lot of different items that turn up, particularly since the 1.4 update. I'm a bit of a magpie and like to collect everything, even something like five more inventory spots would be incredibly handy. Also for players who like all-day fishing trips, etc. Keeping it to later-game availability like having a large price tag would avoid any possible unbalancing, I think.