Why Hulongo Cooler Backpack? 1.Hulongo backpack cooler offers 2 separated insulated comparments for dry warm foods and wet cold drink. Thickened foam of insulation and back/shoulder strap padding makes it keep cold longer and more comfortable to carry. Whether you're heading to the beach, going on a picnic, hiking, camping, grocery shopping, this backpack will ensure your items stay at the right temperature throughout the day.