The MSR Dromedary 4 L Bag is a burly bag for hauling water. The 1000D fabric is tough-as-nails, ideal for seasons of backpacking, climbing, and camping. The food-grade polyurethane is BPA-free for safe drinking, plus it won't deteriorate if the water freezes or has been added while at a high temperature (boiling). The included cap allows for pouring, drinking, and filling without having to switch lids or spill.