I was skeptical but wow, I wish I bought one of these sooner. I typically run with an armband for my phone and a small water bottle with a fabric hand-grip/pocket for my water and keys. The FlipBelt replaces all that and now my arms and hands are free, which after so many miles of always carrying something, is very liberating. The belt is snug but not uncomfortably so, and it doesn't move while running. Your mileage will very in this regard I imagine, depending on sizing, but for me it was great. I required no adjusting while running at all. Also recommend the FlipBelt branded water bottles as well.

To sum up, if you're concerned about carrying your keys, phone, water, wallet, etc while you run and would like to be free from that and have some peace of mind, give this item a shot.