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At two pounds, Hyperlite Mountain Gear's 3400 Windrider Backpack is one of the lightest backpacks in our collection that's equipped to handle weekend trips. Despite its ultralight weight, the Windrider is surprisingly comfortable and durable for long hikes. Its Dyneema Hardline suspension system includes spacer mesh foam at the shoulder straps, back panel, and waist belt, and there are supportive aluminum stays that we can remove for even less weight.