40 oz. Double-Wall Recycled Stainless Steel Tumbler with Straw – a 40 oz. marvel crafted from recycled 304 stainless steel. Its matte finish, ergonomic handle, and compatibility with car cup holders make it both stylish and practical. The recycled PP lid and powder coating ensure longevity, while the vacuum insulation keeps hot drinks warm for 8 hours and cold ones refreshing for 24 hours.