Our traditional down mummy bags deliver high value and performance in a lightweight bag. Ideal for backpacking but versatile enough for couch surfing, they are insulated with DownTek and use baffle construction for efficient heat distribution. If you're in the market for a mummy shaped bag constructed with high quality, lightweight materials these bags are your ticket to traveling fast and light. Men's Spike Lake 15 Degree (600 DownTek) Sleeping Bag