My pack is 70-oz. My one water bottle holds 20-oz. I sometimes freeze it. So for long rides I fill the Tailwind/Poweraid void with a collapsible. These are claimed 16oz but more like 14.5. amazon, sports water bottles by clever creations. I could barely get the plastic squirt cap protector off but "good" I twist off the cap and guzzle it all anyway. I filled & squeezed hard, no leaks. Made out of kryptonite. Stuff down in your pack. weighs nothing empty. $7.00 for three. Can double as a sidewall repair. I wouldn't trust the carabiners for rock climbing accept if a beer is 3'ft up on a rock ledge!