Walmart sells a small clip and strap that you can hook on to your 16.9 ounce bottles and hang them from your belt or pack. I bought two for 99 cents each. I put 2 20 ounce bottles in my fanny pack with 2 16.9 ounce bottles hanging off empty. When I got to Trail Camp I topped off every thing and then left one 16.9 bottle at TC for the trip down. I had drank 30 ounces by that point so I had about 27 ounces to get to the summit and back. I didn't need the 16.9 when I returned but my partner did.
I usely always have an empty soda bottle with me even when using a Camelbak. I like to chug water at the top off spots and that's easier with a bottle. Camelbak is easier on the move, soda bottle is easier to chug. When I need to take a motrin or something, I like the soda bottle better........................................DUG
