FastBack hydration packs are designed to keep the weight of fluid/gear low and close to the seat or frame, where it has the least effect on bike handling. In most cases these packs can be used to carry gear instead of a bladder, if you prefer. Many riders don't use bladder fluid systems and prefer conventional water bottles but nonetheless should not miss out on the great versatility of the hydration packs as multi-use gear bags. We think this is an amazingly useful aspect of these Bags that they make such great cargo carriers. More aerodynamic and compact than conventional panniers and with enough smaller bags as seen in some of our photos, you can have the capacity to nicely organize your gear for anything from a long day ride to randonering event or double century in any kind of weather.
A note about fit: One of the best things about recumbents - and one of the worst - is the variety of designs, dimensions, and parts. That's good because it gives riders so many options.
It's bad because a part or accessory compatible with one recumbent may not fit another. That's why we offer so many choices: Chances are good we have a hydration pack that will fit your bike or trike.
Still, because of differences in seat fore-aft position, seat recline angle, tire size, and other variables, it is possible that a particular hydration pack won't fit a particular bike despite our recommendations or experience.
Sometimes the only way to know for sure if a FastBack will fit is to give it a try...that's one reason we have a 100% satisfaction policy and no-hassle returns.