Void bag

When you cast this spell, place the container in front of you and flip a coin. On heads, the container becomes a bag made of dark magic. On tails, the spell fails, and you take 1d4 Void damage.

The bag weighs nothing when empty. You can put items, one-time-use abilities you own, or hit points inside it. Another player can also give you permission to store one of its one-time-use abilities in the bag.

The bag weighs as much as all physical items inside it combined. Stored abilities and hp don't add weight.

You can add or remove stuff whenever the bag is open. When you seal the bag, nobody can see what is inside, including you. You can open it again at any time to reveal what is inside

A stored ability can be used once before it is consumed. Stored hp are taken from your current hp and can be recovered later. You can’t store hp when you are below 25% Hp

The bag can hold up to 50 pounds of physical items and 25 hit points.

If the bag is destroyed, all items fall out, while stored abilities and hit points are gone