Asedal's Extra-dimensional Hat (5e Equipment)

Wondrous Item, rare (requires attunement by a wizard)

Asedal, a wizard famous for his paranoia and conviction that his magical secrets were being stolen. He created this wide primed pointy hat, both to keep his books and scrolls close but also to keep his enemies reading his mind.
You gain a +2 bonus to all Intelligence, Wisdom and Charisma saving throws while you are wearing this hat. The hat also contains an extra-dimensional space 1 foot in diameter at the mouth and 2 feet deep. The hat can hold up to 20 pounds not exceeding a volume of 64 cubic feet. The hat weighs less than 1 pound, regardless of its contents. Retrieving an item from the hat requires an action. If the hat is overloaded, pierced, or torn, it ruptures and is destroyed, and its contents are scattered in the Astral Plane. If the hat is turned inside out, its contents spill forth, unharmed, but the hat must be put right before it can be used again. Breathing creatures inside the hat 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 the hat inside an extradimensional 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.