Marmot
Marmot Trestles Elite Eco 20 Sleeping Bag
$200
Best Sleeping Bags · head-to-head
Marmot Trestles Elite Eco 20 Sleeping Bag vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag
A sourced, side-by-side comparison. Big Agnes Sidewinder SL 20 Mummy Sleeping Bag is cheaper at $199.96. Every spec and price links to its source.
Big Agnes
Big Agnes Sidewinder SL 20 Mummy Sleeping Bag
$199.96Cheaper
Which is better: the Marmot Trestles Elite Eco 20 Sleeping Bag or Big Agnes Sidewinder SL 20 Mummy Sleeping Bag?
The Big Agnes Sidewinder SL 20 Mummy Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Big Agnes Sidewinder SL 20 Mummy Sleeping Bag is the cheaper at $199.96. The Big Agnes Sidewinder SL 20 Mummy Sleeping Bag both leads on specs and costs less — the straightforward pick.
See Marmot Trestles Elite Eco 20 Sleeping Bag on Amazon See Big Agnes Sidewinder SL 20 Mummy Sleeping Bag on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  Marmot Trestles Elite Eco 20 Sleeping Bag |  Big Agnes Sidewinder SL 20 Mummy Sleeping Bag |
|---|---|---|
| US price | $200 | $199.96 |
| Brand | Marmot | Big Agnes |
| Released | — | — |
| Temperature rating (°F) | 20 | 20 |
| Insulation type | synthetic | down |
| Fill power | — | 650 |
| Shape | mummy | mummy |
| Packed weight (lb) | 2.37 | 2.25 |
| Packed size | 9.4 x 18.9 in | 6.5 x 8 in |
| Zipper side | left | center |
| Product note | HL-ElixR Eco Micro recycled synthetic insulation; dual-zipper with secondary vent zip; ISO comfort 32F, lower limit 21.6F; listed weight 1,077 g | 650-fill DownTek hydrophobic down with body-mapped FireLine ECO synthetic at pressure points; designed for side sleepers; center ambidextrous zipper |
Sources — Marmot Trestles Elite Eco 20 Sleeping Bag: rei.com (verified 2026-06-20). Big Agnes Sidewinder SL 20 Mummy Sleeping Bag: campman.com (verified 2026-06-20).
What's the difference between the Marmot Trestles Elite Eco 20 Sleeping Bag and Big Agnes Sidewinder SL 20 Mummy Sleeping Bag?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Insulation type: Marmot Trestles Elite Eco 20 Sleeping Bag synthetic vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag down
- Packed weight (lb): Marmot Trestles Elite Eco 20 Sleeping Bag 2.37 vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag 2.25
- Packed size: Marmot Trestles Elite Eco 20 Sleeping Bag 9.4 x 18.9 in vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag 6.5 x 8 in
- Zipper side: Marmot Trestles Elite Eco 20 Sleeping Bag left vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag center
- Product note: Marmot Trestles Elite Eco 20 Sleeping Bag HL-ElixR Eco Micro recycled synthetic insulation; dual-zipper with secondary vent zip; ISO comfort 32F, lower limit 21.6F; listed weight 1,077 g vs Big Agnes Sidewinder SL 20 Mummy Sleeping Bag 650-fill DownTek hydrophobic down with body-mapped FireLine ECO synthetic at pressure points; designed for side sleepers; center ambidextrous zipper