The RTIC Day Cooler has plenty of room to store what you need to keep cold for up to 24 hours. The outside is made of heavy-duty polyester & the inside utilizes a high density insulation. If you choose to use ice in your cooler we recommend putting loose ice is a plastic bag to avoid leaks. Includes an adjustable shoulder strap for carrying comfort. This cooler bag has two places to store water bottles, extra snacks and small gear—a zippered pocket in the front and two mesh pockets on the sides. 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.