Evergreen vs Altos Down Sleeping Bag: Which Keeps You Warmer?
By TETON Sports | Published: 2026-10-29
Category: Comparisons
Compare the TETON Sports Evergreen flannel bag and Altos Down 0°F mummy bag to find which sleeping bag keeps you warmer in cold weather.
Quick answer
For serious cold-weather camping, the Altos Down 0°F mummy bag provides superior warmth and a contoured fit, while the Evergreen flannel bag offers cozy comfort for milder nights at a budget-friendly price.
Warmth and insulation approach
The Altos Down 0°F uses down fill in an oversized mummy shape to trap heat efficiently, making it ideal for sub-freezing temperatures. Its fitted design minimizes heat loss while giving you extra room to move.
The Evergreen Sleeping Bag relies on a thick flannel lining and canvas shell for a soft, warm feel, but its rectangular shape allows more heat to escape, making it better suited for cool summer nights or mild fall camping.
Comfort and space trade-offs
The Altos Down is wider at the shoulders and longer at the feet than standard mummy bags, reducing claustrophobia without sacrificing warmth. This makes it a good choice if you want mummy-bag efficiency but dislike feeling trapped.
The Evergreen offers a roomy rectangular cut that lets you stretch out fully. Its flannel lining feels like your favorite shirt, but the extra space means your body heat has more area to warm, reducing overall thermal efficiency.
Trade-offs at a glance
- Warmth for freezing temps: The Altos Down 0°F is rated for sub-zero conditions with down fill and a mummy fit that seals in heat. The Evergreen lacks a temperature rating and is not designed for extreme cold. Choose Altos Down if you camp in winter or at high altitude.
- Budget and comfort: The Evergreen is significantly more affordable and offers a soft flannel feel that's perfect for car camping or backyard sleepouts. The Altos Down costs more but delivers serious insulation. Pick Evergreen for casual, mild-weather trips where price matters.
- Space and mobility: Both bags offer generous room: Altos Down in a mummy shape that still lets you move, Evergreen in a full rectangle that lets you sprawl. Altos prioritizes warmth; Evergreen prioritizes freedom. If you hate mummy bags, the Evergreen is the roomier choice—but you trade warmth.
Product facts at a glance
- Altos Down 0°F: Oversized mummy bag with down fill; wider at shoulders and longer at feet for maximum mobility while maintaining heat preservation. You get the warmth of a mummy bag without the tight, restrictive feel, so you can roll over and stretch out while staying warm in freezing conditions.
Altos Down 0°F - Evergreen Sleeping Bags: Canvas sleeping bag with flannel lining; rectangular shape designed for soft, cozy comfort reminiscent of a flannel shirt. The plush flannel lining feels great against skin, but the rectangular cut and lack of draft collar mean it's best for milder weather where extreme insulation isn't needed.
Evergreen Sleeping Bags
Which sleeping bag fits your trip?
Best for
- Cold-weather campers who need reliable warmth down to 0°F and want a mummy bag that doesn't feel restrictive.
- Budget-conscious campers who camp in mild weather and prioritize soft, flannel comfort over extreme insulation.
Not for
- Winter backpackers or anyone camping in sub-freezing conditions should not choose the Evergreen—it lacks the insulation and draft protection needed for those temperatures.
