Nefeeko collapsible water bottles are popular choice for outdoor activities and travel. 1. Over 50% space saving. When filled with water, the silicone bottle expands to its maximum size and collapses to a smaller size when empty, taking up minimal space in your backpack or handbag. 2. Hassle-free travel. A must-have for flights, cruises and hikes, it attaches to your rucksack with the carabiner clip to provide a convenient source of water on the go. It can be easily emptied to get through security and refilled with water once you are through. 3. Environmentally friendly. The Silicone Water Bottle is made from food-grade platinum liquid silicone and is BPA-free, phthalate-free and non-toxic. The bottles are environmentally friendly and recyclable, reducing the need for disposable plastic water bottles. The reusable water bottles are strong and durable and are highly resistant to impact and corrosion. 4. Essential for fitness. A collapsible water bottle is a convenient option for carrying water at the gym, when running or cycling. It can be attached to a bike rack or carried in a bag for easy hydration at all times. 5.Nefeeko collapsible water bottles can withstand extreme temperature, it can be frozen and suitable for hot liquids.