I purchased this for a brand new yeti tundra 45, it fits perfectly! Installation was a breeze, but it definitely has to be stretched more than an inch like the instructions indicate to get past the yeti logo. Excellent accessory and Im glad to have it!
I have one of these in my yeti 24 and 35. Keeps things out of the water or small bottles from getting lost amongst other stuff. We use for cheese, sandwiches, small fruit, airplane bottles, medicine that needs to be kept cool. I ordered the medium.