航海家隨行杯（附透明翻蓋及吸管）

I’ve been using this tumbler daily for a week and the double-wall insulation keeps my iced coffee cold for over four hours—even in a hot car. The twist-on lid is genuinely leak-proof, so I can toss it in my bag without worry.

The clear flip lid seals tight enough that I tossed it in my bag without any leaks. Ice cubes from this morning are still floating around after several hours.

I’ve had mine for two weeks and the double-wall insulation genuinely keeps my iced coffee cold through an entire shift, even in a hot car. The twist-on lid seals tight enough that I can toss it in my bag without a single drip, and having two straws means I’m never stuck washing one mid-day.