This is the Zeagle 6 Cubic Foot Pony Bottle Pouch Features: Secures entire bottle Allows you to hand off to another diver Elastic nylon material Made from an elastic nylon weave, this pouch securely holds a 6 cubic foot tank, allowing it to be quickly zipped and unzipped from your LTD wing. A nylon webbing strap secures the neck of the bottle while still allowing the whole pony bottle system to be slid out of the pouch to be handed off to another diver.