The ml Gingerilli 890ml Stainless Steel Flip Straw Tumbler IceFlow leakproof flip straw tumbler features double wall vacuum insulation to keep drinks cold for 12 hours (48 hours when iced). It has a built in flip straw for easy and effortless sipping, and a convenient folding handle. It also fits comfortably in most car or bike cup holders. Every piece of this stainless steel tumbler is dishwasher safe.