this is the roll bag, by marti guixe for authentics. like most of authentics' products, the idea for this design is so simple, and doesn't really need any explaining at all! the bags come in three sizes, are easy to clean, and come in some great colours too. as the photos below show, they would be perfect as either a lunch bag, or a toiletry bag, or anything else you could want to store in them.
they are available from madeindesign for between £10 and £15, which is a pretty good price i think! if you go to the authentics website, you will see many similarly useful products, the only downside being the whole site is in german (which makes navigating it a bit difficult if you don't speak it).
previously, i have posted on marti guixe's latest collection for alessi, which is another great food related find worth checking out.