This frame bag has been designed to accompany all cycling adventurers whether on the road gravel mountain bikes or hikers. Available in 3 volumes the Z Adventure C2 C3 and C4 can be mounted on all bikes using the removable and adjustable straps. The volumes are sufficient to carry a vest in addition to the repair kit a phone a battery a pair of gloves... The size is to be chosen depending on your needs but also depending on the space inside your frame. Universal Mounting: Attachment using removable and adjustable self-gripping straps. Waterproof: IPX4 welded bag with waterproof material Wide opening: Better access to the content. Storage: Inside zipped pocket. Lightweight: Durable and light material Specs Material: Polyester 600D TPU Zip: Water repellant zip Mounting: Universal Using Self Gripping Staps Dimensions: 500 x 140 x 65 mm Weight: 238g Capacity: 4.2L