Rift Tumbler 10 oz (Stone)Why It Made The List Compact and purposeful, this 10 oz tumbler shows VSSLs talent for refining everyday kit. The double wall stainless steel body feels solid without bulk, keeping drinks hot or cold while sitting comfortably in the hand. The VaultLoc lid makes it 100 percent leakproof for travel, while the slip proof silicone base keeps it steady on desks, dashboards and uneven surfaces. Its clean, tapered shape drops easily into a pack or cup