XLAB Stealth Pocket 300 Frame Aerodynamic Bag Strapless version of Stealth Pocket 101 Fits bikes that have the two bosses on the top tube behind the stem for mounting, such as the Cervelo P5 and the Trek Speed Concept 8.4" (21.3cm) L x 2.5" (6.4cm) H x 1.5" (3.8cm) W