Evecase Bike Saddle Bag Bicycle Strap-On Under Seat Post Trail Pouch Bag Cycling Case - Black Evecase Bicycle Strap-On Under Seat Trail Pouch Bag offers a narrow streamlined design suits road saddles and minimizes wind resistance for a storage solution that will not slow you down. Velcro straps attach easily and quickly to seat posts and saddles. Easily attaches to bicycle seat posts and saddles to provide storage for keys, ID card, cell phone, tools, tire lever, patch kits, and other smaller personal items. The bottom zipper can be undone to expand the storage capacity. Premium reflective trim for low light or night riding safety. Loop on back to attach a bike tail light for added visibility and safe riding. Water-repellent cycle bag, easy to clean and spacious enough for essentials. Designed of thick nylon fabric with heavy duty zippers and ABS plastic hardware. Made to last through the roughest trail riding. Size: Medium. Dimensions: 7 x 4.5 x 3-4.5 inches. Weight: 5oz. Fits perfectly under most bicycle seats. Perfect for mountain bikes, beach cruiser, hybrid, and single or fixed gear bicycles.