Stash

A PC with an Adventurer's Pack has a stash. A stash can hold any number of items that are no bigger than a chest.

In order to access any item in their stash, a PC must use an additional Action compared to what using that item would take if it were part of their Equipment.

Encumbrance

If a PC wants to carry something that would not fit in their stash, but is reasonable for them to carry, they are Encumbered.

Note: Spells like Floating Disk or other magic items to help carry large items.