It's going to depend on your front end setup and whether or not you use spacers below the base bar etc ... Here is a good example of a really well setup IA / Torhans30. If you're limited on space there is also a Aero20 which holds 650ml
http://shop.torhans.com/collections/hydration
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"Train so you have no regrets @ the finish line"
http://shop.torhans.com/collections/hydration
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"Train so you have no regrets @ the finish line"