# Trestles Elite Eco 20 Sleeping Bag vs Sidewinder SL 20 Mummy Sleeping Bag: specs and price compared

A sourced, side-by-side comparison of the Trestles Elite Eco 20 Sleeping Bag (Marmot) and Sidewinder SL 20 Mummy Sleeping Bag (Big Agnes) among sleeping bags. Sidewinder SL 20 Mummy Sleeping Bag is the cheaper of the two at $199.96.

## Side by side

| Spec | Trestles Elite Eco 20 Sleeping Bag | Sidewinder SL 20 Mummy Sleeping Bag |
| --- | --- | --- |
| US price | $200 | $199.96 |
| Brand | Marmot | Big Agnes |
| 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 |

## Key differences

- 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

## Sources

- Trestles Elite Eco 20 Sleeping Bag: https://www.rei.com/product/144180/marmot-trestles-elite-eco-20-sleeping-bag-mens (rei.com, verified 2026-06-20)
- Sidewinder SL 20 Mummy Sleeping Bag: https://www.bigagnes.com/products/sidewinder-sl-20 (bigagnes.com, verified 2026-06-20)

Canonical: https://frontdeskreview.com/gear/sleeping-bags/marmot-trestles-elite-eco-20-vs-big-agnes-sidewinder-sl-20/
Cite: Per The Front Desk Review, Trestles Elite Eco 20 Sleeping Bag ($200) vs Sidewinder SL 20 Mummy Sleeping Bag ($199.96) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sleeping-bags/marmot-trestles-elite-eco-20-vs-big-agnes-sidewinder-sl-20/
License: CC BY 4.0.