Eco-Friendly Pop Quiz Hip Pack - BlackPop Quiz Hip Pack by Herschel. Pack light, move fast. A two pocket hip pack for life's little things, the Pop Quiz Hip Pack is made with 100% recycled EcoSystem fabrics and wears on the hip or over the shoulder for easy journeys. Dimension: 7"(H) x 12. 25"(W) x 3. 5"(D) Volume: 3. 5L EcoSystem 600D Fabric made from 100% recycled post consumer water bottles Tonal stripe EcoSystem Liner made from 100% recycled post consumer water bottles Zippered