A very good product, but. . .
"A very good vest—it runs slightly small but fits well thanks to the adjustment dial. I used it on a 60k trail run with the 2L Hydrocore bladder and two 500ml bladders on the front. The only downside is that the 500-ml bottles, with their rigid bases, cause pain in my ribs despite the anti-chafing reinforcements on the vest. I’m not sure if this is because the vest is too tight or not tight enough. Otherwise, it’s a great product."