The most important part was that this bag got through security, and it did! Other important points:
-It was extremely adjustable. Had lots of room to loosen and tighten.
-It fit my (small) wallet and smart phone with PLENTY of room to spare. It's very nice that it had two pockets as well.
-The straps feel high quality and thick, not flimsy, and the plastic/vinyl material is thick as well.

Would recommend, and I will definitely be using this a lot at concerts/raves/festivals.