Material...UL/Ultra Light Size...50-100 L Thank you for viewing. This item is a ULA Equipment Circuit backpack. This product is a 55L backpack purchased from MLG, and it features an outstanding carrying comfort that you wouldn't expect from an UL backpack. There are almost no scratches or stains on the backpack itself, but as shown in the third and fourth photos, there is a dent on the right shoulder part due to the capture being attached, so please be aware of this when purchasing.