Peace Frogs Peace Frogs Day Trippin' Backpack & Lunch Combo Both the Day Trippin' backpack and the Lunch Sack are made from 600D Polyester. Roomy main compartment, front zipper pocket with organizer panel Key fob, padded back panel and shoulder straps. The Lunch Sack is insulated The Lunch Sack has a roll-top buckle closure.