lunch bags

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so i've never really used real lunch bags...usually used brown bags or plastic bags when in school. now that i'm about to start my pediatric residency, i want to buy a relatively cheap (<$20), good-sized, insulated lunch bag so i can be more likely to bring my lunch and snacks when at the hospital/on call so i don't eat cafeteria food/vending machine snacks. any suggestions? just from using google, my eye has come across lunch bags by built ny. if you have one of those, what do you think?

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