10 Best Sleeping Bag Liners 2026 in the United States

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 Friendly Swede Sleeping Bag Liner is a soft and comfortable travel accessory designed to enhance your camping or hiking sleep experience. Made from microfiber that feels like cotton, it offers a cozy and breathable surface, making it suitable for all seasons. One of its key benefits is adding up to 10°F of warmth to your sleeping bag, which is great for chilly nights in fall and winter while still managing moisture well during warmer weather. Its generous size of 41 by 86 inches, including a pillow pocket, allows most adults to sleep comfortably without feeling cramped.

Weighing around 1.1 pounds, it’s light enough to carry easily, yet sturdy enough to protect your sleeping bag from dirt, sweat, and bugs, which helps extend the life of your gear. The full-length zipper on the side adds convenience for getting in and out quickly and also allows for ventilation when needed. Machine washable and easy to care for, this liner is practical for repeated use on various trips. While it offers added warmth, it’s not designed as a standalone sleeping bag, so very cold weather campers will still need proper insulation beneath it.

The bright orange color might not appeal to everyone, but it does make the liner easy to spot in your gear. With a solid customer rating and a lifetime warranty, it is a dependable choice for campers looking to stay clean, comfortable, and a bit warmer during their outdoor adventures.

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.