Is the Simple Modern 40 oz Trek Tumbler Worth It?

How the Trek tumbler's handle and insulation actually work

Here's what I'd want to know first: most tumblers this big give up on the cupholder. Once you're at 40 oz, the vessel usually flares out too wide to fit a car console or bag pocket, so it rides loose on the passenger seat. The Trek's trick is holding a cupholder-friendly diameter while still carrying that much liquid, which only works because the handle takes the load off your grip. Instead of wrapping your whole hand around a wide, heavy cylinder, you hook two fingers through the handle and let the straw do the rest, so you can drink at a stoplight without tipping anything. Underneath that, it's a double wall vacuum insulated build: two layers of stainless steel with the air pulled out between them. Air is a poor conductor of heat, so with nothing to carry warmth in or out, your cold brew stays cold and your tea stays hot for hours instead of sliding toward room temperature by lunch. That's the whole payoff of vacuum insulation, and it's also why the outside stays dry and comfortable to hold even when the inside is packed with ice. The lid and straw come apart for the dishwasher, and the body is food grade 304 stainless, so there's no plastic taste creeping into your water by the third refill.