| Shape | Straight-sided, no hood |
| Strengths | Roomy, comfortable, affordable |
| Trade-off | Colder & heavier for the warmth |
| Best for | Car camping, warm weather |
A rectangular sleeping bag has straight sides and no taper or hood, giving plenty of room to move and the option to unzip it into a blanket. It’s comfortable and affordable for car camping and warm weather, but the extra dead air space makes it colder and heavier for its warmth than a mummy bag.
Rectangular vs mummy
Roomier but less efficient than a mummy bag — see mummy vs rectangular. Great for car camping.
Frequently asked questions
What is a rectangular sleeping bag?
A rectangular sleeping bag is a classic box-shaped bag with straight sides and no fitted hood. It gives roomy, unrestricted space to move and often unzips fully into a blanket, making it comfortable and versatile — the typical choice for car camping and milder conditions.
Rectangular vs mummy bag?
Rectangular bags are roomier and more comfortable for restless sleepers but heavier, bulkier, and colder for their warmth; mummy bags hug the body and add a hood to maximize warmth-for-weight, ideal for backpacking and cold. Choose rectangular for comfort and car camping, mummy for performance.
Are rectangular sleeping bags warm?
They can be fine for warm and mild conditions, but the extra interior space means more air for your body to heat, so they're less efficient and colder for a given amount of insulation than a mummy bag. For cold-weather trips, a mummy shape is warmer.
Sources
- Sleeping bag shapes — American Hiking Society