These are plain white popcorn bags - they are gusseted on the sides and flat on the bottom. They are not SOS/lunch bags style where they stand up, but if you have popcorn in it, you can make the bottom thicker so that it will prop up better.
I have printed on them but just make sure that you load it in backwards so that it doesn't jam your printer and that means your artwork on the computer should be upside down (depending on your setup of course). Loading it in the printer with the open end will likely jam the printer since the printer will think there are two sheets of paper!
Great for DIY custom popcorn bags!