This sackcloth bag has the appearance of being completely full, yet it is as light as a feather. 

This bag has 2 hours worth of wind. Using an action, you can open the bag and release a portion of the wind in 1 minute intervals. 

The wind is released in a 60 foot line. Any creature in the line must make a DC 15 Dexterity saving throw. On a failure, they take 4d6 bludgeoning damage, pushed back 10 feet and are knocked prone. On a success, they take half damage and are not pushed back or knocked prone.

When the bag is completely empty of wind, it can be utilized as a Bag of Holding.