These are a perfect travelers aid. Exactly as advertised, sturdy, and after purchasing several I have never found one flaw in the mfg. For airline/TSA liquids they are perfect. Never had one question on them and they do hold more than a regular quart size freezer package. I also use them for putting in the misc. items that you would normally put in the plastic cup/tray like my cell, change, wallet, etc. It keeps things together yet easy to pull from your bag and drop in the bin as you move through the TSA line without delay. Also, like packing cubes they are great for regular packing but being transparent they are handy for the small items that you usually want without having to paw through the other stuff. Handy in a briefcase or the "personal item" in that you can put several in your bad and locate them fast and easily. I love these.