Bag of infinite pebbles

This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The bag can hold infinite pebbles. The bag weighs 15 pounds, regardless of its contents. Retrieving a pebble from the bag requires an action.

If the bag is overloaded, pierced, or torn, it ruptures and is destroyed. If the bag is destroyed in any way, it will rematerialize in the most recent owner's hand at dawn. Obtaining ownership of the bag requires a ritual which includes the current and new owners of the bag and must be sealed by a "spitshake". 

Notes: Utility, Container