Detachable small backpack - anatomically shaped removable back system with alu braces- breathable padded and anatomically shaped shoulder and waist straps- 2 main compartments with separate side acceses- side and bottom compression straps- chest and waist belt with pockets- fixation form trekking poles and other equipment- adjustable lid with inner and outer pockets - side pockets and side zipper pockets- water bladder spout holder- raincover-reflective points.