Large Capacity Bike Pannier Bag- 10L large capacity, enables you to store small tire repair tools, taillight, glove, tissues, phones, power bank, water bottle, beverages, and other essential items you need during cycling. With a mesh pocket inside, allows you to keep small things like keys or credit card. There is a pocket and strap at the top of the bike rack bag for expanded capacity to hold more items such as collapsible umbrellas, convenient to take out and store.High Quality Material- Made of waterproof polyester material and water-resistant seam-sealed zipper, which is durable and long-lasting. Internal aluminum foil insulation design, helps keep drinks and foods warm or cold.Safe Reflective Design- Designed with reflective straps on the side, makes it visible at night, which is safer for your cycling. With a taillight hook on the back of the bike carrier bag for hanging taillight (TAILLIGHT NOT INCLUDED). The thoughtful design will escort your night riding.Portable Bike Back Rack Bag- Comes with carry strap, you can carry rear bike bag anywhere if you leave your bike. Side adjustable water bottle holder for easily take the water bottle out and avoid it fall out on a bumpy ride. Suitable for bike, electric bicycle and other commuter bikes, especially perfect for your short bicycle riding.Easy to Install & Place- No tools needed. There are 2 magic straps, just place this bike rear rack bag on the rear rack of your bike, adjusts the strap to a suitable length and moderate tightness of your bike, prevents rear bike rack bag from shifting.