Dimensional Locker

As you cast this spell, an extradimensional hole appears in front of you.  Only the caster may access this locker,  though all contents are thrust onto the material plane upon death.  This locker has an interior that is roughly 2 feet in diameter at the mouth and 4 feet deep. The space can hold up to 500 pounds, not to exceed a volume of 64 cubic feet. Placing an object inside follows the normal rules for interacting with objects however retrieving an item only requires a bonus action. When you reach into the space for a specific item, the item is always magically on top.  This spell cannot be cast upside down as the space does not comply to this planes gravity.  Any orientation it is cast at, it always open correctly.  Breathing creatures inside this space can survive up to a number of minutes equal to 10 divided by the number of creatures (minimum 1 minute), after which time they begin to suffocate.