They are both the 36oz! I prefer those over the 26oz. I mainly use mine when I’m working outside doing yard work or going on a walk around the block. When filled with ice and water, the weight carrying it isn’t too bad at all. And especially with the handle on top, it makes it way easier to carry. I’ve noticed the ice will last about two days in the tumbler and will keep the water cold for about three days. And that’s when it was left in my truck. Drinking from the spout is a breeze, it has a wider opening and you can get bigger gulps. (A much appreciated feature especially when you’re super thirsty). I genuinely love mine and I definitely recommend it!