The 2400 Southwest by Hyperlite Mountain Gear is an exceptionally lightweight yet durable and water-resistant backpack made from a Dyneema composite hybrid fabric with taped seams and a double bottom. The Southwest 2400 has an internal capacity of 40 liters and an additional 10 liters with external pockets and an extended roll-top closure. Ropes, trekking poles, and similar items can be attached to the top strap or the outside. The backpack features removable aluminum stays, a padded back, and a wide hip belt with two waterproof zippered pockets. On the outside, it has three stretch mesh pockets to help prevent snagging.