REI is known for its budget/performance products, and the Polar Pod 0 is a good example of this philosophy. This mummy bag provides comfort down to 0 degrees, weighs a moderate four pounds, and costs $99. It uses synthetic polyester fiberfill insulation that retains its insulating properties even when wet. This comes at the cost of weight that is greater than down bags, which are lighter but lose their insulating properties when wet. The bag uses a shingled construction to maintain distribution of insulation throughout the bag. The hood has differentiated drawcords to adjust the hood and neck openings. A pocket inside the hood can be stuffed with clothing to form a pillow. There is also a side-mounted chest pocket placed outside the bag for storing small night items such as headlamp. The side zipper is insulated by a full-length draft tube. The bag also offers pad loops for securely attaching the bag to a sleeping pad. Both a nylon stuff sack and larger cotton storage bag are included. The bag comes in regular and long sizes. The Polar Pod 0 is an excellent low-cost bag that will keep you warm in moderately cold winter conditions. It is particularly recommended for camping and hiking where carrying weight and packing bulk are not critical issues.