I went trail running last night and thought I'd share my experience. Basically it was really hot so a little bottle wasn't good enough. So I took my big 24 ounce Polar insulated bottle that I use for biking. This one is the new style, like with neon orange highlights. Anyway, even though it was big, it didn't seen awkward at all. Up around the neck where there is a cutout for a bike cage to grab on to, the new style has even bigger dimples on each side of those. So basically I was able to get my fingers around this area and hold the water bottle like a football. It didn't bother me at all. I've tried this with several other bottles and it was really weird due to them being big, but now I think it's more of a question of whether you can get your fingers around some area than it is the actual size of the bottle. It was a little heavy at first, but if you drink alot like I do, it lightens up pretty quick.