This bag has an interior space considerably larger than its outside dimensions—roughly 2 feet square and 4 feet deep on the inside. The bag can hold up to 500 pounds of organic material. The bag weighs 5 pounds, regardless of its contents. Retrieving an item from the bag requires a Utilize action.
This bag has a permanent enchantment on it that causes any organic material inside it to be kept in a state of preservation as if it had the spell gentle repose cast upon it. This effect wears off as soon as the item is removed from the bag, and the bag must be completely closed in order for its ability to function.
A living creature placed inside the bag can take an action to try to escape, doing so with a successful DC 15 Strength (Athletics) check. Any creature that starts its turn inside the bag takes 2d12 cold damage and its maximum hit points are reduced by that amount. If the creature reaches 0 hit points it dies and freezes.
If the bag is overloaded, pierced, or torn, it is destroyed, and its contents are scattered in the Astral Plane. If the bag is turned inside out, its contents spill forth unharmed, but the bag must be put right before it can be used again. The bag holds enough air for 10 minutes of breathing, divided by the number of breathing creatures inside.
Placing a Bag of Cooling inside an extradimensional space created by a Heward’s Handy Haversack, 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 a 10-foot-radius Sphere centered on 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.