Sarah did a great write-up on lunch boxes for work last year, and I wanted to add one more that's great for ADULT sized lunches. The Lunch Box by OOTS! started the trend for well designed boxes and was created by Arian Roefs and Godfried Konings, a Dutch team that relocated to Santa Fe, New Mexico. There are great pics here of a mom testing one.
All materials used are food safe and kid-friendly: made of BPA-free and
phthalate-free polypropylene plastic, and safety tested for lead. The Lunchbox comes in three different color combinations: Blue, Green and Orange.