Western Mountaineering Bag Expander Three Season

The Western Mountaineering Sleeping Bag Expander was created for campers who just want more room. The Expander offers comfort for people who dislike the claustrophobic feeling of a mummy bag (it can be used on the top or underneath your mummy bag.) The Expander is available in either a 3-season or a summer weight. The Expander features a full-length 70 YKK #8 coil separating zipper black 50 denier Ripstop Nylon double layers of Polarguard 3D insulation with offset stitching and built in draft tubes along the zipper. All of these features combine to create a highly compressible expander that is lightweight, breathable, absorbs little moisture and, keeps its loft even when wet.