L

Took this to the lake last weekend and my drink was still cold after four hours in direct sun. The size L fits my cup holder perfectly, which I wasn't expecting. Solid buy for the price.

The liner holds ice way longer than I expected, and the zipper glides smoothly every time I open it. I’ve already used it for three beach trips and my drinks stayed cold through the whole afternoon.

Finally, a cooler that actually fits a full bottle upright without turning into a leaning tower. The lid seals tight enough that I can toss it in my bag sideways and not stress about leaks. Size L gives me just enough room for ice and a can, which is exactly what I needed for long work days.