KUKOME-SHOP Sports Rucksack Multifunctional Backpacks for Cycling/Camping/School, 22 Liters nylon-mesh Dimensions: height / width / thickness = 47cm*26cm*15cm Capacity: 22L; Weight: 700g Main Material: waterproof nylon KAM Buckles: can withstand low temperature of Minus 40 to 50 degrees, Emergency Survival Lifesaving Whistle included Reflective article let your night sports more safer