The New FrostPak Slinger introduces great new functionality with dual removable ModPok sling packs on each end to offer you a convenient shoulder sling pocket to transport water bottles, cell phones, wallets, and credit cards. Always available for an extra adventure, the ModPoks offer great convenience, and with 2 included, your friend has one as well! Combine the ModPoks with heavy-duty FrostPak and you've got a great cooler combination at a great price. Introducing the Arctic Double Wall Coolers. Dual-layer insulation keeps ice for twice as long! The expedition-proven coolers feature a waterproof liner that prevents ice melt from penetrating insulation and are waterproof up to the zipper. Soft-sided build allows for collapsibility and easy storage when not in use.