I purchased these for an upcoming trip and though I haven't used them yet, they were pretty much exactly what they said.  The reviews of others was also helpful.  They seem sturdy, and they are clear so you can see what is in them.  I will probably use one for passports and travel documents.  Some of the envelopes are a bit small, but will be good for organizing the little things that get lost in the bottom of my backpack.  If you want to know the exact sizes of the envelopes you can go to Travelon's website.  For the price they are good even if you don't use them all.  They would also be useful for organizing household items or for in the car.