What are some mundane items adventurers would use in a dungeon? Stuff like rope, mirrors, oil flasks etc.
Things that lets you get clever in getting around encounters and traps, gets your creative juices running.
Bag of flour for anything invisible.
Jar of marbles for anything with legs.
Smoked goggles for anything bright.
Climbing spikes for anything steep.
A lantern for heat and light.
A spare lantern.
Canary in a cage, pay attention to it.
A simple spring coil powered toy.
A pocket watch.
Salt for bad food and upset stomachs.
Spirits if they exist in the setting.
Candles and torches.
A bag of cobwebs or poultry down.
A pot and pan.
Spork or two.
A grappling hook.
A really long pole.
Timber and a few logs.
A trusty Kalashnikov.
Lots of cord or string.
An iron wedge.
Small glass bottles.
Blank paper and charcoal.
A book to keep you sane.
think of it like cat whiskers.
if the hole is too small, then you should avoid it unless you have both a good reason and stout companions whom are less maneuverable than yourself...