Wondrous item, uncommon
This backpack has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The backpack can hold up to 500 pounds, not exceeding a volume of 64 cubic feet. The backpack weighs 15 pounds, regardless of its contents. Retrieving an item from the backpack requires an action.
If the backpack is overloaded, pierced, or torn, it ruptures and is destroyed, and its contents are scattered in the Astrale Sea. If the backpack is turned inside out, its contents spill forth, unharmed, but the backpack must be put right before it can be used again. Breathing creatures inside the backpack 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.
Placing a magischer Rucksack inside an extradimensional space created by a similar magical item instantly destroys both items and opens a gate to the Astral Sea. The gate originates where the one item was placed inside the other. Any creature within 10 feet of the gate is sucked through it to a random location on the Astral Sea. The gate then closes. The gate is one-way only and can’t be reopened.