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There are two types of weight to consider when choosing hiking backpacks. These are FSO Weight and Packweight. "From the Skin Out" or FSO Weight is the weight of everything you carry on the outside of your skin. This includes your backpack, but also your apparel such as socks, boots, and other garments. Your Packweight is the weight of your backpack alone. This does not include any the provisions (i.e., food or drink) you are bringing.