Durable Material- Made of 600D twill fabric, abrasion-resistant and water-repellent. Can provide maximum protection for the contents of the bag. Reflective strip for increased visibility and safety at night.Like the Warm or Cold Bag- The insulated main compartment keeps food and drinks warm or cold. It's well insulated and will keep drinks very cold for hours with an ice pack. Allows you to enjoy the coolness on long journeys.Create More Space- Elastic bungee cord on the top to keep your clothes or cards securely on the bag and increase storage space. With a detachable, adjustable shoulder strap, this bicycle case bag can also be used as a shoulder bag.Easy Installation- Don't worry about the stability while driving. Simple attachment to the bike rack with two adjustable Velcro straps for quick installation and removal.Versatile- It's huge, it's simple, it's isolated. Ideal for packing lunch on the go, groceries, snacks, groceries, hot or cold drinks, bike tools, jersey, towel, etc, no space is wasted here