The Spark is a great little storage bag. Super versatile, it has two velcro straps underneath and one on the end. This lets it attach to the top of a tube on your bike or trike and not slide down or slide around. Lots of recumbent trike riders put them on the front crossarms out by the headset where they are easy to get to while riding. The straps are long enough to go around a 60mm (2.4in) diameter tube- plenty for nearly any recumbent trike or recumbent bike.
The Spark has an easy opening zipper cover and, at 3 x 2.5 x 5 inches (7.6 x 6.4 x 12.7cm), just the right amount of room inside for your wallet, phone, spare tube, energy bars, whatever you'd like. Made to last in USA with top quality materials throughout.