Nalgene Silo Hdpe Wm 48 Oz 2179-0048. It easily slides into standard packs and side pockets. The neck configuration works with most major water purifiers and filters. Specifications for Nalgene 48 oz HDPE Wide Mouth: Manufacturer: Nalgene Color: White Fabric/Material: Hard Plastic Application: Outdoor Additional Features: BPA Free Non-Insulated Weight: 0.3 lb Capacity: 48 oz / 1.4 L Hydration Cap Type: Loop Cap Features of Nalgene 48 oz HDPE Wide Mouth: Standard 63-mm Loop-Top cap HDPE plastic Nalgene 48 oz Wide Mouth - White