Reusable lunch bag

With my efforts to reduce my evironmental impact, I'm going to make my hubby a reusable lunch bag to take to work. Normally he takes a brown paper bag, but once the ones we have are gone, I won't be buying anymore. I'm going to look and see if there is a pair of courdery pants that my daughter has outgrown that I can use to make this... http://weefolkart.com/content/reusable-lunch-bag-directions#comment-2146 How cute is that!