Insulated bags having at least three unitary layers of durable material are provided. In one embodiment, a first set of unitary layers of durable material forms a front wall, a bottom wall, and a rear wall. Two additional sets of unitary layers of durable material form side-walls. Edges of the two additional sets are joined to side and bottom edges of the first set by adding webbing and stitching together the joined edges and webbing. Disposed within the two inner most layers of the first set and the two additional sets is at least one layer of insulation. The first set and the second set are sealed at their top edge to secure the insulation. Horizontal webbing is attached to the bag via stitching through the horizontal webbing, each of the layers of the first set and the second set, and the at least one layer of insulation. Vertical straps are integrated into the bag between the horizontal webbing and the outer most layer of durable material of the first set. On the top of the bag is a mini-flap. Hook/loop fasteners are strategically positioned on the bag to secure access points on the bag. Optional features can be incorporated into the bag (e.g., side handles, a top handle, a durable bottom, a grommet, and a liner). Other embodiments of insulated bags are described herein (e.g., a bag that has the outer layer of the first set and the second set sandwiched between two layers of horizontal webbing).