Rift Tumbler 16 oz (Stone)Why It Made The List Designed for generous pours and long days, VSSL's 16 oz tumbler balances serious capacity with a clean, well formed shape. The double wall stainless steel body feels robust without turning bulky, keeping drinks hot or cold while sitting comfortably in the hand. Its VaultLoc lid makes it 100 percent leakproof for travel, and the slip proof silicone base helps keep it steady on desks, dashboards and uneven surfaces. The tapered form