Strongboxes are pretty rare though, and as you mentioned, we mostly put wands/scrolls in them. I was thinking wand/scroll cases would be lighter and made of more fragile materials (I was thinking wood for scrolls and leathers for wands), but with a SoCM could be made into a pretty decent replacement for a strongbox, the downsides being the need for a SoCM and the limitation on storage type, so strongboxes would still be the superior choice, if heavier.
I quite like the magic chest and portable hole ideas too.
A variety of containers would be nice. It gets pretty silly once you get around to hauling around a few chests late game. I know the icebox was brought up before, which would slow food spoiling. We could have rarer, more powerful versions equivalent to a chest (mini fridge) that prevents food spoiling and an equivalent to a large chest (large fridge) which freezes items e.g. a bottle of water becomes a bottle of ice, throw for blunt weapon training. Maybe even a rare Magic Fridge furniture, blessed by Mellis, which fills cans and bottles over time. As well as a scroll tube, a lightweight container that can hold up to x number of scrolls only. Perhaps even a suitcase for wands, a wand case.
Sorry but that's an idea I have to shoot down. Heavy armour is obsolete as is, if we make scars give armour we may as well remove heavy armour from the game entirely.
Mmm, I have a different idea. As you get more scars, you get more used to recovering from damage? So your health gets lower, but you heal faster. Basically trading off stats for survivability. Could use that as an incentive to wear heavy armour to make tanking viable.
You can already wield a corpse of a snake, yes? Its blood is already poisonous, yes? How hard would it be to make it poison enemies when you smack them with it?