航海家隨行杯（附透明翻蓋及吸管）

I was pleasantly surprised how well the double-wall insulation keeps my iced coffee cold for hours during my commute. The cupholder-friendly base fits perfectly in my car’s cup holder without wobbling.

The flip lid twists on securely and the double-wall insulation does keep my coffee hot for a good while, so it works fine for the price. That said, the straws feel a bit flimsy and I wish the lid were more spill-proof when tossed in a bag, though it's fine for desk use.

It keeps drinks cold long enough, but the lid isn't as leak-proof as I'd hoped—it dribbles a bit if it tips over in the cupholder. The two straws are a nice touch, though.