PocketUp’s newest creation, the Wai Pocket, can carry a very wide array of water bottles. The belt or pack mountable Wai Pocket features a flap to retain the bottle, an open bottom to allow drainage, and it is designed to allow one-hand access to the contents.
This pouch offers very wide compatibility with basically all common water bottles. PocketUp has tested all of the following to fit securely – 32oz Nalgenes, 48 oz Nalgenes, 40oz Hydroflasks, 1 qt USGI canteens, and 2 standard 16.9oz water bottles. There are, of course, a lot of other similarly sized bottles and other items like some cooksets that will also fit.