Great for stainless steel and plastic bottles, sport and energy drinks; the neoprene stretches to accommodate most bottles. Go hands free or use without the straps as a comfortable hand held carrier, constructed of soft insulating neoprene, the same material used in wetsuits; insulates your beverages for longer periods of time and reduces condensation build up. Perfect for walking, running, hiking, biking or anywhere in your travels; attach to your backpack and walk or ride unencumbered with the adjustable and removable shoulder strap; suitable for adults and children.