This 25L Mountaintop hiking backpack is made of lightweight anti tear water repellent 500D polyester with reinforced lap knots. It has multi compartment storage with a hydration bladder sleeve and anti theft compartment, ergonomic support straps and compression systems, plus water bladder assembly parts and front elastic rope. Weighing 1.96 pounds and airline compliant, it suits various outdoor activities and daily use for both men and women.