158 oz: The 18 oz Klean Kanteen bottle is for my electrolytes (Tang&Salt mixture). The Two 1.5 liter Smart water bottles are refills for the One Bottle Hydration setup. The feed bag attached to the handlebar, stem and fork is made by Rockgeist and it is called the Honeypot. It Is holding a Nalgene 48oz bottle. I was not happy with water packs and the idea of cleaning them on a trip away from home annoyed me. The setup from One Bottle Hydration Is less complicated to clean. I ordered the kit for the large wide mouth bottles. I cut off the right angle bite valve setup and put the bite valve directly on the tube. This works if you order the silicone tube. I didn't like their bite valve, so I took the wide mouth bite valve off of my Platypus hydration bladder and put it over the end of the silicone tube. So I have a wide mouth bottle that can hold over 50 oz with a custom lid that holds a long straw with a bite valve on one end.