Hyperlite designed this streamlined, lightweight water-bottle holder specifically for the Porter 40, 55, 70 or 85 Packs. Weighing just 2.15 ounces (61 grams), this lightweight Nalgene^™ water bottle holder easily attaches to the daisy chains of your Porter Pack allowing quick and comfortable access to your water bottle. Secure it to the daisy chains on either side of your pack with the side release buckle, and hold it in place with the locking shock cord.