Trailstead Summit Slide-Lid Tumbler

A 590 ml vacuum-insulated tumbler for people who drink coffee by the session, not the cup. The Summit's double-wall construction keeps drinks hot around four hours and iced drinks cold most of a workday — vacuum insulation is symmetric, so it is as good a cold-brew glass in July as a coffee mug in January. The powder-coated exterior adds grip and shrugs off scratches better than bare steel. The sliding lid closes the sip port against splashes on a bumpy drive, though it is splash-resistant rather than fully leakproof; for a bag, choose our flip-lock Ridgeline instead. Honest trade-off, stated plainly. The tapered base fits cup holders, the mouth is wide enough for ice, and the lid pulls apart for a real wash.