| | DOUBLE POCKET The Double Pocket Model substitutes an additional storage pocket for the backpack straps, handles, and adjustable/removable shoulder straps. 4 layer insulating system To provide maximum thermal and moisture protection, Altieri case covers are constructed from tough, water-resistant black nylon for the outer shell, and an insulated liner. This unique four-layer insulating material is designed to reduce heat loss in winter and heat gain during summer. Two thermal layers, a plastic moisture barrier, heat reflecting mylar , plus a smart canvas coating combine to pad and insulate delicate woodwind instruments and their cases from the elements. Heavy duty zippers, sturdy nylon straps and high quality fasteners
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