The Jack Wolfskin Velo Jam 15 bike backpack is a practical backpack for trail riders and is designed to carry everything you need for short rides * volume: 15 L, weight: 560 g * dimensions: 43 x 23 x 18 cm * 1 .material: 100% polyester * 2nd material: 100% polyamide * lining: 100% polyester * CROSS RIP 210D/300D: very light, durable ripstop fabric with reinforcing threads * main pocket with two-way zip, freely accessible water bag compartment inside with outlet (not included) * front zipped pocket with carabiner * two side stretch free-access pockets * integrated raincoat located at the bottom * AEROSHAPE: very light full-contact back system with excellent ventilation, sustainably produced from recycled components and reduced material consumption * breathable . * bicycle backpack, cycling backpack