10 Best Sleeping Bag Liners 2025 in the United States

The Tough Outdoors Sleeping Bag Liner is made from 100% cotton, which makes it soft and breathable—a great choice if you want a comfortable sleep liner for camping, travel, or hotel stays. It's lightweight and portable, weighing just about 0.1 pounds, so it won’t add much bulk to your backpack. The size is generous, fitting adults up to 6’6” with an 85 x 37-inch rectangular shape, offering plenty of room to move around during sleep. The full-length zipper makes it easy to get in and out, and also lets you use it as a cover or a travel sheet, adding versatility. Its temperature rating is marked as ‘comfort’ and suitable for all seasons, meaning it’s good for mild to moderate weather but might not keep you warm in very cold conditions.

The cotton material is easy to wash, which keeps things hygienic and fresh, a big plus for travelers or campers who use it repeatedly. On the downside, cotton liners can absorb moisture and dry slower than synthetic fabrics, so it might not be the best option for damp or very humid environments. Also, if you're looking for extra warmth or insulation, this liner is more about comfort and cleanliness than thermal protection. This product is ideal for those who want a simple, comfortable sleeping liner that’s easy to carry and care for, especially for casual campers, travelers, or hotel users who want to keep their sleeping environment clean.

The Frelaxy Ultralight Sleeping Bag Liner is a great choice for travelers and campers looking for a lightweight and compact sleep option. Made from polyester, it feels soft and breathable, mimicking cotton but with less weight, which is ideal when you want to pack light. Weighing only about 196 grams and folding down small, it won’t take up much space in your backpack or luggage. Its size (84.6 by 37.4 inches) fits most adults comfortably and even includes a handy pillow sleeve for extra coziness. The liner is designed for summer use with a temperature rating between 16 and 30 degrees Celsius, so it’s best suited for warmer nights but won’t provide enough warmth in cold conditions.

Its synthetic fabric dries quickly and can be easily machine washed, making it practical and hygienic for repeated travel and camping. One small downside is that it doesn't have a zipper, which some users might miss for easier entry or closure, but that also means less weight and complexity. This sleeping bag liner serves well as a lightweight, breathable layer for travelers, backpackers, or hostel stays who need a clean and comfortable sleeping surface without extra bulk.

The Friendly Swede Sleeping Bag Liner is made of microfiber, providing a cotton-soft feel while being breathable. This liner is designed to add up to 10°F of warmth to your sleeping bag, making it suitable for cold weather. It is generously sized at 41 inches in width and 86 inches in length, including a pillow pocket, which should be ample space for most adults. Weighing in at 500 grams or 17.6 ounces, it is relatively lightweight but may not be the best choice for those seeking ultralight packing options.

For those needing a balance between comfort and portability, it is a good fit. The liner is machine-washable, adding to its ease of care, which is a significant plus for camping trips where staying clean can be challenging. The full-length zipper allows for easy entry and exit, and the durable construction means it can withstand the rigors of outdoor use. It also plays a crucial role in keeping your sleeping bag clean by acting as a barrier against sweat and bacteria.

One drawback might be that while it’s great for adding warmth, it may be less effective in extremely hot conditions compared to liners made specifically for cooling. The lifetime warranty offered by The Friendly Swede adds a layer of assurance for long-term use, making it an appealing option for regular campers.