Speed Capsule TT is our take on the direct mount bag for a top tube, down tube or anywhere else you can mount a storage pack. The key benefit of Speed Capsule TT is its rigidity, which allows the rider to more easily open and close the pack while riding. Many bags in this category lack a stable internal structure which leaves them prone to buckling as the rider is trying to access the contents. Not only is it annoying when this happens, but it also takes the rider's focus away from the road. The base of the Speed Capsule TT is a PE board that runs the length of the bag. A high-strength 200D nylon body with 3M reflective side panels and a weather resistant locking pull zipper complete the structure. We also gave Speed Capsule TT oval eyelets which allow for 10mm of fore/aft adjustment. If you're a triathlete, long-distance cyclist, or just like having easy access to your food and other riding essentials, then this bag is for you.