TuffCup Double Wall Stainless Steel Bamboo Bottle Vacuum Insulated Coffee Travel Mug, Fruit and Juice Infuser, Wide-mouth, Portable 14.9 Oz Water Bottle Tumbler. BPA, Rust, and Leak-Free It's TOUGH. The TuffCup double-walled stainless steel bamboo flask will keep your beverages cold for 12 hours, hot for 6, yet is still lightweight enough to keep with you everywhere.We were sure to source the highest quality, most durable cup we could find. It Has Extras- We're also including a FREE tea steeper that fits right in the bottle- or you can remove it to use for hot coffee, cold drinks, or whatever else you decide. It's Sleek - Laser-etched logo, plastic screw-top, with bamboo design- this is a great looking product. BPA Free- Food grade steel inside means no BPA. Save big on plastic bottles, and help the environment. Hand wash, do not microwave.