Yumbox Gelato Ice Packs Set of 4 ice packs. Keep your Yumbox packed lunch cool & fresh. Reusable non-toxic, BPA-free. Compact slim design. Custom designed to fit neatly with your Yumbox. Keeps food cool & fresh for 4-6 hours. Use two or more for extended cooling time. Dimensions: 5.65 (l) x 3.8 (w) x .73 (d) inches.