ボイジャー タンブラー（クリアフリップリッド＆ストロー付き）

The double-wall insulation really works—I poured coffee at 7am and it was still pleasantly warm at noon. The included straws are a nice touch too.

I love that this tumbler actually keeps my iced coffee cold for hours without diluting it. The clear flip lid seals tightly enough to toss in my bag, and having two straws means I always have a clean one ready.

The twist-on lid seals well enough that I can toss it in my bag without worrying about leaks. The double-wall insulation keeps my iced coffee cold for a good few hours, though I wish the straw were just a tad longer.