Nalgene Oasis BPA Free Waterbottle. Remember the old metal canteen? Well it’s been re-imagined for the new century. Sometimes you challenge yourself; other times you’re challenged by the elements. In either case, you need the new Nalgene Oasis. Large enough to pack a serious hydrating punch while staying portable. It’s made from durable Eastman Tritan with a Leakproof threaded cap. As tough as it is stylish, it’s the coolest canteen in camp.