Plastic Drink Bag is not just an outdoor essential, but play an important role in our daily life. Reusable, and refillable, it’s significantly lighter in weight than a hard water bottle of comparable volume and, when empty, collapses to take up a fraction of the space. While it’s designed for outdoor pursuits like camping, thru-hiking, and backpacking, it’s also perfect for travel when space is at a premium. BPA-free, BPS-free. When filled, the base expands so that the bottle stands upright; screw top keeps contents secure.