Western Mountaineering gave the MegaLite Sleeping Bag a roomy cut for those who want an ultralight bag without the coffin-like feeling. This down bag features light, lofty, compressible 850-fill goose down that lulls us to sleep on warm summer backpacking trips and multi-day bike excursions. The bag's continuous baffle system keeps all the down in place so we don't feel a cold spot in future seasons.