10 Best Sleeping Bag Liner For Warmth 2025 in the United States

The Tough Outdoors Sleeping Bag Liner is a lightweight and portable option designed to add comfort and cleanliness to your sleeping setup, especially during summer camping or hotel stays. Made mainly of polyester with some cotton, it offers a soft feel that helps you sleep comfortably. The liner is roomy enough to fit users up to about 6’6", so most adults will find it spacious. Its rectangular shape and full-length zipper make it easy to get in and out, and it can even double as a travel sheet or a cover to keep your sleeping bag clean.

Its temperature rating is for comfort in summer conditions, meaning it won't add much warmth in colder weather. The polyester fabric is easy to wash and quick to dry, which is convenient when on the road. This liner is a good choice for travelers or campers who want a hygienic layer and lightweight packability, while those needing extra warmth for cold seasons should look for liners with thermal insulation. The product scores well in user reviews for comfort and practicality, making it a solid pick for summer use.

The Friendly Swede Double Sleeping Bag Liner is a versatile travel companion, well-suited for anyone needing an extra layer of protection or warmth during their adventures. Made from machine-washable polyester, the liner combines durability with a silky soft texture that feels pleasant against the skin. Its material effectively wicks away sweat, making it suitable for warm climates with a temperature comfort range of 16 to 30 degrees Celsius. This temperature rating suggests it is more of a comfort layer rather than a dedicated warmth enhancer in colder conditions.

Measuring 59" x 79", it's generously sized for two adults, yet still lightweight and portable at just 12 ounces. The full-length zipper design is a practical feature, allowing for easy access and exit, which can be especially useful when sharing the liner. This design also supports versatility in use, from camping to ensuring cleanliness in less-than-ideal accommodations.

On the downside, while the polyester material is easy to care for, those seeking natural fibers might find it less breathable compared to cotton or silk. However, the machine-washable aspect enhances its practicality for frequent travelers. The liner's ability to add significant warmth is limited, so it may not be ideal for colder climates unless used as an additional layer within a sleeping bag. The lifetime warranty offered indicates the brand's confidence in the liner's quality, but potential buyers should consider the primary use as a cleanliness layer or summer travel accessory. It ranks well for its intended purposes, making it a popular choice for backpackers and travelers looking for a reliable, easy-to-maintain solution.

The Friendly Swede Sleeping Bag Liner is a versatile accessory for camping and hiking in various weather conditions. Made of microfiber, it provides a cotton-soft feel while being durable and machine-washable, making it easy to maintain. This liner is designed to add up to 10°F to your sleeping bag, which is beneficial during cold nights, while its moisture-wicking properties keep you comfortable in warmer conditions.

The full-length zipper adds convenience and allows for easy entry and exit. With generous dimensions of 41” x 86”, it offers ample space, even for tall users, and includes a pillow pocket for added comfort. Weighing just 17.6 ounces, it is lightweight and easy to carry in its stuff sack, making it ideal for travel and outdoor adventures.

Some users may find the zipper less durable over time. Additionally, although it protects against sweat and bacteria, it might not completely prevent bed bugs in hostel environments. Despite these minor drawbacks, its lifetime warranty makes it a reliable choice for enhancing sleeping comfort during camping trips.