Very good waterproof bag banana and 100% plastic (not a single piece of metal). Very discreet and efficient sealing system. To get water in there must still going strong. I think the same test when swimming in the sea. You can drag a lot of money and identity papers but also portable, mp3, or radio. Absolutely flat this bag can even be hidden under clothing and go unnoticed. Do not sound detectors in airports so no need to remove it, you can keep it on either undisturbed. The material to air quality but we have to see over time. The strap is somewhat small but great. Accepts all sizes even for very good living + 130kg. This is not the Maxpé but it is still worth the 20 euros. A buy eyes closed.