Lightweight stretch woven material is durable and works with the body's natural movements. Ridged foam back panel for breathability and comfort. Two zippered security pockets hold essentials. The left side opening features internal mesh pockets for easy gear organisation. The middle waterbottle pocket centralises weight while riding. The right side opening features internal mesh pockets with compression phone sleeve and key fob. Fits most tubes including fat-bike and plus-sized models. 100 cu. in. (1.364l) capacity.