This rugged backpack appears ordinary at first glance, though its leather never seems to stretch, sag, or change shape regardless of what is placed inside. Opening the pack reveals an extradimensional space of seemingly limitless depth.
The Backpack of Infinite Holding can contain any number of objects, provided each object can physically pass through the backpack's opening. Regardless of the number or total weight of the objects stored within it, the backpack always weighs 25 pounds.
Placing an object into the backpack requires the same interaction normally required to stow an object.
Last In, First Out
The extradimensional space within the backpack follows one immutable rule: objects can be removed only in the reverse order in which they were placed inside.
The most recently stored object must be removed before any object placed inside before it can be retrieved.
For example, if a sword is placed into the backpack, followed by a lantern, followed by a book, the objects must be retrieved in this order:
Book → Lantern → Sword
A creature cannot reach past, search around, magically select, or otherwise retrieve an object while another stored object was placed into the backpack after it.
If an unwanted object must be removed to reach another item, it can be placed back into the backpack afterward. Doing so counts as placing that object into the backpack again, making it the newest object stored.
Infinite Capacity
The extradimensional space inside the backpack has no maximum weight or volume capacity.
However, an object must be capable of fitting through the backpack's opening to be placed inside. The backpack cannot be used to store an object too large to pass through its opening, regardless of the theoretically unlimited size of the extradimensional space beyond it.
The backpack always weighs 25 pounds, regardless of its contents.
Living Creatures
Breathing creatures placed inside the backpack can survive for up to 10 minutes divided by the number of breathing creatures within it (minimum 1 minute), after which they begin to suffocate. This time can be adjusted by holding ones breath (1+ constitution bonus in minutes)
A creature inside the backpack can't open it or retrieve itself unless the DM determines it has some means of interacting with the backpack's opening from the extradimensional side.
Extradimensional Interaction
I'd also retain the classic Bag of Holding catastrophe, because otherwise the backpack becomes an easy way around one of 5e's established extradimensional-space limitations:
Placing the Backpack of Infinite Holding inside an extradimensional space created by a Bag of Holding, Heward's Handy Haversack, Portable Hole, or similar item, or placing one of those items inside the backpack, instantly destroys both items and opens a gate to the Astral Plane. The gate originates where 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 and can't be reopened.
Destroying or Losing the Backpack
This is one place where I'd make an explicit ruling because unlimited storage makes the consequences important.
If the backpack is torn, destroyed, or otherwise rendered nonmagical, all of its contents are scattered into the Astral Plane. The backpack is destroyed and can't be repaired by mundane means.
Notes: To attune to the Backpack of Infinite Holding, a creature must intentionally place at least one object inside the backpack as part of the attunement process.
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