Large capacity bicycle bag: With a capacity of 10 litres, you can store small tyre repair tools, rear light, gloves, tissues, phones, power bank, water bottle, drinks and other important items you need when cycling. With a mesh pocket inside, you can store small things such as keys or credit cards. At the top of the bike carrier bag there is a bag and a strap for more capacity. High-quality material: made of waterproof polyester material and water-repellent seam-sealed zip, which is durable and long-lasting. The internal design of aluminum foil insulation keeps drinks and food warm or cold. Safe reflective design: with reflective straps on the side, makes it visible at night, which is safer for your cycling. With a rear light hook on the back of the bicycle carrier bag for hanging the rear light (rear light not included). The sophisticated design accompanies your night rides. Portable bicycle back bag: with carrying strap, you can take the rear bike bag anywhere when you leave your bike. Side adjustable water bottle holder for easy release of the water bottle and fall out during bumpy rides. Suitable for bicycles, electric bicycles and other commuter bikes, especially perfect for short bike rides. Easy to install and place: no tools required. There are 2 magic straps. Simply place this bike pannier rack bag on the pannier rack of your bike, adjust the strap to a suitable length and moderate tightness of your bike and prevent the rear bike carrier bag from moving.