The Big Agnes Women's Elsie Sleeping Bag. SYNTHETIC FILL BAGS FOR THOSE WHO PREFER A TRADITIONAL MUMMY BAG DESIGN WITHOUT AN INTEGRATED PAD SLEEVE Traditional mummy bags are designed to be taken anywhere and provide sleep for the weary by providing a cozy fill and a roomier mummy shape than a traditional bag design. Lightweight enough to stuff in your pack for summer backpacking but comfortable enough for backyard camp outs with the kids, these bags are so versatile and comfortable you'll want to take them on every outing.