Travelers of the Cross World Inn
Imperial Long-Range Patrol Haversack
Wondrous item, rare
This backpack appears to be well made, well used, and quite ordinary. It has two side pouches, each of which appears large enough to hold about a quart of material.
This backpack has a central pouch and two side pouches, each of which is an extra dimensional space. Each side pouch can hold up to 20 pounds of material, not exceeding a volume of 2 cubic feet. The large central pouch can hold up to 8 cubic feet or 80 pounds of material. The backpack always weighs 5 pounds, regardless of its contents.
Placing an object in the haversack follows the normal rules for interacting with objects. Retrieving an item from the haversack requires you to use an action. When you reach into the haversack for a specific item, the item is always magically on top.
The haversack has a few limitations. If it is overloaded, pierced, or torn, it ruptures and is destroyed, and its contents are lost forever, although an artifact always turns up again somewhere. If the haversack is turned inside out, its contents spill forth, unharmed, but the haversack must be put right before it can be used again. Breathing creatures inside the haversack 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 haversack inside an extra dimensional space created by a bag of holding, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. 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 Plane. The gate then closes. The gate is one-way only and can’t be reopened.
Notes: Heward’s Handy Haversack, DMG p174