2.0
Fits many mesh seat recumbent bikes including Burley, TourEasy, and Easy Racer; also fits WizWheel mesh-seat trikes.
RB
Our custom-fit pack for RANS and Bacchetta mesh seats only.
4.0
For Catrike, Greenspeed, ICE and Trice mesh seats, and the new Bike Friday SatRDay hard-shell seat.
C100
Fits hard-shell seats on a variety of recumbents, including Volae, Bacchetta, CarBent, and others without rear suspension or frame designs that are tight-behind-the-seat; also fits the RANS Zephyr seat.
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.
70LS
Fits hard-shell seats on bikes and trikes with limited clearance behind the seat, including many lowracers. Also fits the Bacchetta EuroMesh seat.
Double Century
It's like having a 70LS hydration pack on both sides of a hard-shell seat; put a bladder in both packs for long, hot days, use both packs for gear, or put a bladder in one and gear in the other.
70LS-to-Double Century upgrade kit
Converts a single-pack 70LS to a two-pack Double Century.
M70
This new, smaller hydration pack fits many mesh seats where tire clearance is a problem, including Lightning. And, for mesh-seat bikes and trikes where clearance is not a problem it's a smaller, lighter alternative to the FastBack 2.0 and 4.0.
RaceBack
An entirely new way to carry a hydration bladder on some hard-shell seats. Fits between the ribs on M5-type seats; with no zippers, no compartments, and no tubing ports, it makes replacing a bladder as speedy as you are.
Hydration packs
FastBack hydration packs are designed to keep the weight of fluid low and close to the seat, 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.
Seat & bladder compatibility
Use these symbols to tell at a glance whether a particular FastBack is intended primarily for
mesh or hard-shell seats, whether it is happiest with a 2-liter bladder, or whether it will take either 2-liter or 3-liter bladders. Remember, there may be exceptions.
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Nalgene bladders with insulating covers will normally work in packs with this symbol.