Bag of Devouring

Bag of Devouring: This device appears, to all tests, to be a normal Bag of Holding, and in fact it performs exactly like one at first. However, all items placed within disappear forever 1d6+6 turns later. The bag continues to weigh whatever it did after the items were placed within it (that is, one-tenth the total weight of the items), until it is opened and discovered to be empty.