Best Sleeping Bags · Big Agnes · Updated June 2026
Sidewinder SL 20 Mummy Sleeping Bag: specs and price (2026)
Sidewinder SL 20 Mummy Sleeping Bag has a US price of $249.95 (MSRP per bigagnes.com / campman.com; sale pricing observed lower). Below is its full, sourced spec sheet — every value links to the source and the date we captured it.
Specifications
| Price (US) | $249.95 MSRP per bigagnes.com / campman.com; sale pricing observed lower |
|---|---|
| Brand | Big Agnes |
| Released | — |
| temperature rating f | 20 |
| insulation type | down |
| fill power | 650 |
| shape | mummy |
| packed weight lb | 2.25 |
| packed size | 6.5 x 8 in |
| zipper side | center |
| product note | 650-fill DownTek hydrophobic down with body-mapped FireLine ECO synthetic at pressure points; designed for side sleepers; center ambidextrous zipper |
Source: bigagnes.com (verified 2026-06-20) · corroborated by campman.com. Verified: 650 FP DownTek down with FireLine ECO synthetic at pressure points, mummy, center (ambidextrous side-zip) design, regular weight 2 lb 4 oz (2.25 lb), packed 6.5x8 in, MSRP $250 (men's). Confirmed via bigagnes.com and multiple reviews. Corroboration URL updated to Campman review page.
Frequently asked questions
How much does the Sidewinder SL 20 Mummy Sleeping Bag cost?
The Sidewinder SL 20 Mummy Sleeping Bag has a US price of $249.95 (MSRP per bigagnes.com / campman.com; sale pricing observed lower), as of 2026-06-20.
What are the Sidewinder SL 20 Mummy Sleeping Bag's key specs?
Sidewinder SL 20 Mummy Sleeping Bag (Big Agnes): temperature rating f 20, insulation type down, fill power 650, shape mummy, packed weight lb 2.25. Full sourced spec sheet verified 2026-06-20.