Simply put, Vyper has to be the coolest laptop sleeve. We sandwiched durable, semi-rigid high density foam between a layer of 1682D cross-weave ballistic nylon on the exterior and a super non-scratch lining on the interior - an effective blend. Virtually molded around your 17-inch PowerBook, Vyper XL is one of the most compact sleeves anywhere. Use it separately, or as additional protection inside another bag, like the Booq Boa XL. A must-have for every laptop owner!