I purchased this for a summer traverse of the Daisetsuzan mountain range, but I am selling it because I can no longer do a multi-day backpacking trip. I have packed it and tried it on, but I have never actually taken it outdoors. Please refer to the manufacturer's website for instructions on how to fasten the top buckles. See photos 4 and 5. Returns and refunds are not accepted. Please check the macpac website, etc., carefully before purchasing. Below is the manufacturer's product description. This is a lightweight and simple large-capacity thru-hiking backpack designed for long trails and long-term traverses. Despite its 64L capacity, it uses the lightweight and durable new material "AzTec 6oz," and the main body weight is only 1,540g (S2 size). The wave-shaped back foam "Helium Air" provides breathability while fitting the body, providing a comfortable carrying experience. The back wire frame, designed to conform to the curves of the body, stabilizes the backpack. The main body has a roll-top opening for easy capacity adjustment. It also has plenty of storage, including a zippered pocket on the front for storing small items, a large stash pocket for storing jackets, and side mesh pockets that make it easy to take out bottles while wearing the pack. This is a backpack that embodies the macpac style, pursuing a simple and functional design. Fabric AzTec 6oz canvas, 300D polyester Care Instructions: Due to the nature of the material, this product may fade or transfer color when wet or due to friction, so please be careful. Function macpac's lightest hiking harness HeliumAir / roll-top opening / top load lifter straps / side compression straps / large front stash pocket convenient for storing jackets / large front zipper pocket for storing necessary small items / side access pockets that allow you to take out bottles while wearing the backpack / waist belt pockets on both sides / stowable pole/ice axe attachment / removable waist belt / hydration compatible Country of Origin Philippines Size 2 Weight Approx. 1,540g Size: 50-100 L