The New FrostPak Slinger introduces great new functionality with dual removeable 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 ModPok's offer great convenience, and with 2 included, your friend has one as well! Combine the ModPok's with our 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! Our 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.