Marmot
Trestles Elite Eco 20 Sleeping Bag
$200
Best Sleeping Bags · head-to-head
Trestles Elite Eco 20 Sleeping Bag vs Sidewinder SL 20 Mummy Sleeping Bag
A sourced, side-by-side comparison. Sidewinder SL 20 Mummy Sleeping Bag is cheaper at $199.96. Every spec and price links to its source.
Big Agnes
Sidewinder SL 20 Mummy Sleeping Bag
$199.96Cheaper
Which is better: the Trestles Elite Eco 20 Sleeping Bag or Sidewinder SL 20 Mummy Sleeping Bag?
The Sidewinder SL 20 Mummy Sleeping Bag wins 1 of the 1 specs we compare head to head; the other wins 0. The Sidewinder SL 20 Mummy Sleeping Bag is the cheaper at $199.96. The Sidewinder SL 20 Mummy Sleeping Bag both leads on specs and costs less — the straightforward pick.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Trestles Elite Eco 20 Sleeping Bag | 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 — Trestles Elite Eco 20 Sleeping Bag: rei.com (verified 2026-06-20). Sidewinder SL 20 Mummy Sleeping Bag: bigagnes.com (verified 2026-06-20).
What's the difference between the Trestles Elite Eco 20 Sleeping Bag and 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: Trestles Elite Eco 20 Sleeping Bag synthetic vs Sidewinder SL 20 Mummy Sleeping Bag down
- Packed weight (lb): Trestles Elite Eco 20 Sleeping Bag 2.37 vs Sidewinder SL 20 Mummy Sleeping Bag 2.25
- Packed size: Trestles Elite Eco 20 Sleeping Bag 9.4 x 18.9 in vs Sidewinder SL 20 Mummy Sleeping Bag 6.5 x 8 in
- Zipper side: Trestles Elite Eco 20 Sleeping Bag left vs Sidewinder SL 20 Mummy Sleeping Bag center
- Product note: 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 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