The RTIC Day Cooler Backpack is perfect for toting your on-the-go items out to the ballfield, gym, pool, track, sports practice or errands! This backpack has plenty of room to store what you need to keep cold for up to 24 hours. Two mesh side pockets for easy access & storage of water bottles. The top lid has an interior mesh pocket perfect for dry snack bag storage. The outside is made of heavy-duty polyester with an interior utilizing high density insulation. We recommend using (2) Medium RTIC Ice Packs to keep items cold. The soft liner is made of FDA-approved food contact material that's safe for use with food and drinks. Antimicrobial, product-protecting properties are built into the flexible lining to resist odor, mold and mildew, making it easy to clean between uses.