This is a hiker's must have pack! It is light weight (only .57 ponds), but don't let that mislead you. It has a volume of 25 liters, so you have plenty of room for your hiking essentials. The entire bag can also fold into a 9x8x2 smaller pack that you can carry with you until you need a larger bag, or store it out of the way. Pack is water resistant, and includes ventilated mesh shoulder straps for cooling comfort. Backed by a lifetime warranty!