10 Best Sleeping Bag Liners 2026 in the United States

The Friendly Swede Extra Large Sleeping Bag Liner is made from soft microfiber with a cotton-like feel, designed to add about 10°F of warmth to your sleeping bag. Its generous size (44" x 98.5") including a pillow pocket means taller users can stretch out comfortably, making it suitable for most adults. Weighing around 23.5 ounces, it’s fairly lightweight but not ultra-light, so if you need something lighter for backpacking, there’s a polyester version available.

The full-length zipper on the side is a handy feature for easy entry and exit, and the microfiber fabric is durable and machine washable, which makes cleaning straightforward. This liner is versatile for all seasons because it helps wick away moisture in warmer weather while providing extra warmth when it’s cold. It also protects your sleeping bag from dirt, sweat, and bugs, extending its life and hygiene.

While it does add warmth, it’s not a replacement for a thicker sleeping bag in very cold conditions. It is a cozy and practical choice for campers who want a comfortable, easy-to-care-for liner that fits larger users well and works year-round.

The Sea to Summit Reactor Sleeping Bag Liner in Extreme Standard size (85 x 31.5 inches) is designed to add significant warmth—up to 25°F—to your existing sleeping bag, making it a solid choice for winter campers or anyone facing cold conditions. It uses advanced Thermolite Pro fabric, which is lightweight yet insulated, thanks to hollow fibers that reflect body heat back to you. This material also stretches well, allowing good freedom of movement inside mummy-shaped sleeping bags.

The liner's drawcord footbox is a feature that lets you adjust ventilation or snugness at your feet and works seamlessly with certain Sea to Summit sleeping bags. Another practical plus is the HeiQ Fresh odor control treatment, helping the liner stay fresh even after multiple uses, which is advantageous when washing opportunities are limited. Weighing just 0.38 kg, it’s fairly light and compact for backpacking.

While it excels in warmth and hygiene, the price point is higher than simpler liners, and the fixed size may not fit everyone perfectly. Care instructions should be followed to maintain the performance and odor control of the technical fabrics. This liner provides a stretchy, warm, and odor-resistant option that works well in winter and fits mummy bags, with a higher price compared to basic models.

The Browint Silk Sleeping Bag Liner is crafted from 100% natural Mulberry silk, known for its smooth, soft feel that won't irritate sensitive skin. Its silk material helps keep you cool in warm weather, making it ideal for spring, summer, and early fall camping or travel. Measuring an extra-wide 87 by 43 inches, this liner offers more room than typical single liners, which is great if you like to move around while sleeping or are taller. Despite its size, it remains very lightweight at just 6.3 ounces, and it packs down small into a handy carry bag with a hook, making it easy to transport.

The liner includes reinforced gussets in key areas for durability and even has a pocket for a pillow, adding comfort to your outdoor or travel sleeping setup. Temperature-wise, this liner is best suited for environments around 46°C (about 115°F) and above, meaning it is designed for warmer seasons or as a clean, comfortable layer inside your sleeping bag or a hotel bed rather than cold weather protection. Care involves machine washing with cool water and gentle handling to maintain the silk’s quality, which might require more attention than synthetic liners.

If you want a natural, breathable, and lightweight liner that adds comfort and keeps your sleeping bag clean during warmer months or hotel stays, the Browint Silk Liner is a strong choice. Those needing insulation for colder conditions or preferring fuss-free maintenance may want to explore other options.