10 Best Lightweight Summer Sleeping Bag 2025 in the United States

The MalloMe Sleeping Bag is designed as a lightweight and versatile option, ideal for warmer weather camping from spring through fall. It offers a comfortable temperature range from 50°F to 80°F, making it suitable for mild summer nights and slightly cooler conditions. Weighing about 3 pounds (1.32 kg), it’s light enough for backpacking and easy to carry with its included compression sack. The rectangular shape provides ample space for a single person up to 6 feet tall, which is beneficial if you prefer more room to move around while sleeping.

The synthetic insulation is effective for warmth while still being compressible and easy to maintain. Its polyester outer shell uses a waterproof hex-tech design, helping keep you dry in damp conditions and allowing for simple cleaning—either wiping off dirt or machine washing. The double-sided zippers and adjustable drawstrings add practical features for comfort and ease of use. However, this sleeping bag is best for temperatures not much lower than 50°F, so it might not be suitable for colder nights or winter camping.

Because of its rectangular shape, it may not retain heat as efficiently as mummy-shaped bags designed for colder weather. For those seeking a reliable, lightweight sleeping bag for casual camping in mild climates or summer backpacking trips, the MalloMe bag provides good durability and comfort.

This sleeping bag is designed with summertime and mild weather camping in mind, fitting adults up to about 5 feet 11 inches tall. It has a temperature rating of 10 to 20 degrees Celsius (50-68°F), making it suitable for comfortable use in warmer seasons but not for cold weather. The bag is filled with hollow cotton insulation, which offers moderate warmth but is less efficient than down or synthetic fills in colder conditions. It features a semi-rectangular shape that balances comfort with lightweight packability.

Weighing just 3.3 pounds, it’s light enough to carry on hiking or backpacking trips where every ounce counts. The packed size is relatively compact, and it comes with a compression bag to make storage and transport easier. The outer shell is made of 190T nylon with a waterproof and breathable coating, helping keep you dry from light moisture while remaining comfortable. The design includes a drawstring hood to keep your head warm and a foot zipper to adjust ventilation, which is handy for changing temperatures. The materials feel soft and skin-friendly, and the bag cleans easily, which is great for outdoor use.

The cotton filling, while warm, can absorb moisture and take longer to dry compared to synthetic options, which might be a consideration if you expect damp conditions. Also, the temperature range targets lower summer and spring nights rather than true hot summer or cold weather camping. The size fits most adults under 6 feet, which might be tight for taller users. This sleeping bag is a solid choice for casual campers, summer hikers, or anyone needing a lightweight, waterproof summer sleeping bag without breaking the bank. It's especially good for those who want an easy-to-maintain, warm-enough bag for mild weather and appreciate the convenience of a compact, portable design.

The Kelty Cosmic Synthetic Fill 20 Degree sleeping bag is a solid choice for campers seeking a lightweight and reliable 3-season bag that handles cooler summer nights comfortably. It has a temperature rating of 20°F, which means it’s warmer than typical summer bags designed for mild nights but great if you want extra warmth or plan to camp in chillier conditions. Weighing just under 3 pounds, it’s relatively light but a bit heavier than ultralight summer-only bags. Its synthetic Cirroloft insulation is a big plus, as it keeps warmth even if damp and resists cold spots, which is handy if you expect moisture or sweat inside the bag.

The mummy-shaped design with a roomy footbox offers comfort and helps retain heat without feeling cramped. The nylon shell is durable and the included compression sack helps keep the pack size manageable at 16x9 inches (non-compressed), making it suitable for backpacking without taking up too much space. One limitation is that at 20°F rating, it might be too warm for hot summer nights, so users in very warm climates might prefer a lighter, cooler bag.

While it’s good for single occupants up to 6 feet tall, taller users or those wanting a looser fit might need to look for a longer size. This bag is well-suited for campers who want dependable warmth, durability, and decent packability for cool to moderately cold summer adventures, though it’s not the lightest or coolest option if you only camp in hot summer weather.