Sierra Designs Cloud 800 F 35 Deg Reg

Product Overview

Bring the comfort of home into the backcountry with this innovative sleeping bag from Sierra Designs. Designed to balance comfort, versatility, and backpackability, the Cloud 800 35 offers a zipperless, “comforter” style layout combined with high-performance down insulation. A great choice for three-season adventures when you want more freedom of movement and better comfort than a traditional mummy bag.

Key Features & Benefits

• Zip-free “comforter” design: Instead of a full-length side zipper, this bag uses an oversized cover-style comforter that wraps around you, giving you more freedom to sleep in different positions without zippers getting in the way. 

• 800-fill-power DriDown® insulation: High quality down treated for water resistance, delivering excellent loft and warmth for its weight. 

• Breathable, light shell/liner fabrics: 15-denier nylon ripstop for both shell and liner keeps the bag ultra-light yet durable. 

• Sleeping pad sleeve built in: Keeps your pad from slipping out during the night, ensures the bottom remains aligned and insulated. 

• Self-sealing foot vent: On warm nights you can pop a foot out to regulate temperature, or allow more airflow—handy for flexibility in varying conditions. 

• Generous fit and comfort orientation: The bag is purposely roomy in the shoulders and hips compared to ultralight bags, making it suitable for side-sleepers or anyone wanting more space. 

Specifications (Regular size)

• Temperature rating: around 35 °F (~2 °C) for comfort. 

• Insulation: 800 fill DriDown

• Fabrics: 15d nylon ripstop shell and liner 

• Shoulder girth: ~60″ (152 cm) Regular size 

• Hip girth: ~58″ (147 cm) Regular size 

• Footbox girth: ~40″ (102 cm) Regular size 

• Packs down to a relatively compact size for back-packing. 

Best Use Cases

• Three-season backpacking (spring through fall) when nighttime temps dip into the 30s °F.

• Campers who want a bit more room to move around (side or stomach sleepers) rather than being tightly constrained like in a mummy bag.

• Backpacking trips where comfort matters nearly as much as pack weight and where you might lounge in your bag, stretch out or relax.

• Those who appreciate thoughtful features like a pad sleeve and foot vent for flexibility.

Considerations

• Because of its comfort-oriented design (roomier fit, extra features) the warmth-to-weight ratio won’t match the most minimalist mummy bags built purely for cold and weight savings. 

• Down insulation performs best when kept dry; use with a tent or tarp and keep moisture out of the bag.

• As with any sleeping gear, individual comfort will vary based on metabolism, clothing, pad, and conditions—be sure to test it in a safe setting before relying on it in the backcountry.

Summary

If you’re looking for a high-quality sleeping bag that offers more freedom of movement, comfort-enhancing features, and an innovative design, the Sierra Designs Cloud 800 35 is a standout. It blends the warmth and compressibility of 800-fill down with a roomier, more bed-like experience than many traditional bags. Ideal for those who don’t want to sacrifice comfort for packability.