2L Storage Capacity Zippered Compartment Universal Easy-Install Rubber Seat Post Mount and Velcro Saddle Rail Strap System Stealthy Reflective Black Side Panel Accents Interior Pocket and CO2 Holders External Tail Light Hang Loop Features: Quick Release Rubber Strap Installation (Non-Velcro Post Mount) Reflective Side and Rear Facing Trim Internal Pocket and CO2 Holders Light Mount Specs: Size: 7.5" x 4" x 4" (19cm x 10.15cm x 10.15cm) Capacity: 120 Cubic Inches (2.0 Liters)