Have worn these shorts on a few trail runs so far. Got them in the very cool blue print which I love! They're unbelievably comfy, the waistband is great. Really like the pocket in the waistband also, I find particularly useful for a shorter hill run where I only really need an emergency snack. I have easily fit some gels and a pair of gloves in the back pocket with no effect to the feel of the shorts. I would guess a very small soft flask would fit too. Such a lightweight and soft material with a bit of give. I like these shorts because they just give a little bit of extra coverage. My only gripe would be the lack of zipped key pocket, I do understand that there's a little key pocket internally at the front with a loop for secure attachment, but I just find it a slightly odd place to have my key pressed against me? Could be just what I'm used to though.