Sresk Large Capacity Motorcycle Backpacks for Men, Hiking Backpacks with USB Charging Port Motorcycle Helmet Backpack Cycling Backpack

USB Charging Port: The innovative design of the USB charging port on the side of the Sresk motorcycle helmet backpack provides a convenient way to charge your devices while riding. There are reflective strips on the helmet backpack and an emergency whistle on the chest strap.. Great Space: Helmet backpack measures 10.23""L x 8.27""W x 18.5""H (Weight: 3.3 lbs), Capacity: 26L. The backpack expands freely 90-180 degrees, has a spacious main compartment and lots of pockets to help you sort your items quickly.. Ergonomic Design: The adjustable chest strap distributes the weight of the backpack to the chest and waist, reducing the pressure on the shoulders and neck, making cycling and hiking comfortable and easy.. Hidden Compartment: Helmet backpack strap can be stored in the backpack when you don't need to carry the helmet, and it will turn into an ordinary backpack to accompany you when hiking, cycling, mountaineering, hunting and other outdoor sports.. Premium Materials: Sresk helmet backpack is made of heavy-duty double-stitched nylon and polyester fabric. The adjustable shoulder straps and back are equipped with a comfortable and breathable sponge mesh design for good heat dissipation.