I use it to bring my lunch to work most days, and I am always surprised at how much food it can fit. The bag is also very light, which is great for when I'm coming back from work.
BUILT has a bunch of designs for lunch bags, including this cute roll top, expandable one:
For the past few weeks I have been eyeing this reusable sandwich bag:
I always feel bad throwing away zip locks from sandwiches, so I decided it was worth gifting myself this bag. I am so happy with it so far!