Our Free Flow Lock allows you to lock open for easy cooling and frequent sipping, and when closed, the mug is leak-proof so you can travel with confidence. Made of durable 18/8 stainless steel with double wall vacuum insulation so your coffee or tea stay the ideal temperature for hours on end. Full powdercoat finish and non-slip silicone base help make it even more durable for wherever adventure takes you. Easy to clean: Arm flips up for thorough cleaning of all parts, and the cap and vessel are both dishwasher safe. Free of BPA, BPS, and BPF. Compatible with the CamelBak Tea Infuser Accessory so you can take your sustainable sipping on the go. Available in 3 sizes to allow you to have the perfect travel mug for your needs: 12 oz, 16 oz, and 20 oz.