TETON Sports Mammoth Sleeping Bag Liner – 91x58 in, Dark Grey, Machine Washable

Elevate comfort on outdoor trips with the TETON Sports Mammoth Sleeping Bag Liner. This oversized, soft-brushed poly-flannel liner is designed to slip inside double sleeping bags, delivering an extra layer of warmth and a clean sleeping surface. Its generous 91" x 58" rectangular footprint fits Mammoth and similar double bags, and the liner is both machine washable and dryable for easy maintenance after camping, backpacking, or cabin stays.

The breathable fabric feels smooth against skin, like a premium sheet, while the wide opening on both sides makes it simple to crawl in and out without disturbing a partner. When used in varying temperatures, the liner can add noticeable warmth, helping you stay comfortable on cool nights or drafty sites.

Beyond warmth, the Mammoth liner helps protect your sleeping bag from dirt, oils, and wear—potentially extending its life and reducing the need for frequent bag washing. It also doubles as a cozy travel sheet for hotel rooms or air travel, and its soft surface can serve as a lightweight blanket or guest sheet when company is visiting.

Key features at a glance

• Oversized, 91" x 58" design compatible with TETON Mammoth sleeping bags and similar double bags
• Soft, breathable fabric that feels comfortable against the skin
• Machine washable and dryable for quick cleanups after outdoor use
• Two-sided opening for easy entry and exit
• Includes a compact stuff sack with drawstring for hassle-free transport
• Limited Lifetime Warranty and responsive customer support

Care and use tips to get the most from your liner

• Machine wash cold; tumble dry low to maintain fabric softness
• Use as a standalone warm-weather sleep sheet or as an inner layer during cooler nights
• Pair with your Mammoth sleeping bag for a clean, cozy sleeping setup on the go
• Store in the included stuff sack for camping trips, cruises, or flights

Whether you’re camping, traveling, or spending a night away from home, this liner offers a practical, flexible comfort option. It’s designed to be easy to care for, easy to pack, and easy to enjoy—an approachable upgrade to your outdoor kit that works with your existing gear and routines.