Blaze Defense Systems All Purpose / Water Bottle Pouch
Comes only in black. Fits most bottles (pictured with 16oz soda bottle) but could be used as a pouch for anything similar.
Molle strap on the back has a secure strap for belt or other attachment. Molle on back has been incorrectly stitched for two molle straps so cannot be molled unless you have your own malice clips or other type of connector for molle.