The HAJKER is the optimal hiking day pack with a big 30-liter main compartment with a rolltop and an inner dry sack, waterproofing your gear for all kinds of weather. Store the stuff you need quick access to in the two zippered side pockets and compress it all together from the outside to get slimmer profile and a stable backpack that doesn't bounce when you are out exploring, climbing, or running in the roughest terrain. Do you hate it when your water freezes? Everyone does! The included Thermo Cell insulation technology uses your body heat to protect the drinking tube and the pockets on the shoulder straps, perfect for storing gels and food. The compression sleeve keeps the hydropack in a tight and secure position (hydration bladder is NOT included). The waist belt secures the lower part of the backpack and can also be detached and used on its own, like a hip-pack. You also got a helmet carry system that is detachable and van be stored in a pocket when not in use. HAJKER is a great waterproof adventure daypack, with a rolltop opening and plenty of smart storage solutions. The pack is made for high-speed activities and is equipped with USWE bounce free No Dancing Monkey™ 2.1 harness system and waist support belt that makes the pack stay put on your back without cramping your style. Zero bounce with No Dancing Monkey™ 2.0 + Snug-Me - Harness developed and tested with top athletes to give you the perfect fit with no compromises, with absolutely no bounce. Anti-freeze - Thermo Cell insulation technology uses your body heat to protect the drinking tube from freezing. NDM™ Buckle - Technical buckle for a more secure closure and a better fit. 2-in-1 - The waist belt can be used on its own, perfect as a lightweight hip-pack for short rides. Waterproof - Rolltop opening to keep your gear safe from all kinds of weather. 30 liters of total storage - Fit everything you need for a full day of adventure.