20 oz insulated tumbler

Most 20 oz insulated tumblers are made from stainless steel. Several listings specify food‑grade 18/8 stainless steel as the material, which is the most commonly noted option.

Some tumblers feature an exterior powder‑coat finish for grip and durability, and several listings note a copper‑coated layer inside the vacuum‑sealed insulation to enhance thermal performance.

Some packages include accessories such as a stainless steel straw, a straw cleaner, a BPA‑free clear lid, stickers or a guide, and are often packaged in a gift box.

Warranty terms vary by brand and listing: some offer a lifetime limited warranty while others provide a 1‑year limited warranty for the product or parts.

Review summaries commonly praise thermal retention and leak resistance, noting that many tumblers keep drinks hot or cold for several hours and that users frequently report the tumblers resist spills.