Big Agnes · Updated July 2026
Sidewinder SL 20 Mummy Sleeping Bag: price & specs
Sidewinder SL 20 Mummy Sleeping Bag. Every price and spec below is linked to its source and dated — no guesses.
Source: bigagnes.com verified ✓ corroborated verify in ledger
The Sidewinder SL 20 Mummy Sleeping Bag is listed at $199.96 on bigagnes.com as of 2026-07-26, #8 cheapest of 17 sleeping bags (median $200); other retailers may be lower. It earns a Bronze Deskmark — 57/100 pay-blind standing, #8 of 13 in class.
Verified Jul 26, 2026 · figures linked to their source in the table below
Price history
$199.96Is the Sidewinder SL 20 Mummy Sleeping Bag a good buy?
At $200, the Sidewinder SL 20 Mummy Sleeping Bag is #9 cheapest of the 17 sleeping bags we track, where the median is $249.95. On the spec sheet, its fill power of 650 is below the median of the 11, its packed weight of 2.25 lb is below the median of the 13, and its temperature rating f of 20 is at the median of the 19.
Specifications
| Price (US) | $199.96 — current on record (was $249.95) |
|---|---|
| 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.
Is the Sidewinder SL 20 Mummy Sleeping Bag worth it vs cheaper sleeping bags?
Sidewinder SL 20 Mummy Sleeping Bag against its closest cheaper and pricier sleeping bags on the specs that matter — every value sourced. See all 17 ranked
| Product | Price | Temperature rating f | Insulation type | Fill power | Shape | Packed weight (lb) |
|---|---|---|---|---|---|---|
| Sidewinder SL 20 Mummy Sleeping Bag this | $199.96 | 20 | down | 650 | mummy | 2.25 |
| Forte Endless Promise Men's Synthetic Sleeping Bag 20F | $199.95 | 20 | synthetic | — | spoon | — |
| Trestles Elite Eco 20 Sleeping Bag | $200 | 20 | synthetic | — | mummy | 2.37 |
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 $199.96, as of 2026-07-26.
How does the Sidewinder SL 20 Mummy Sleeping Bag compare on price?
At $200, the Sidewinder SL 20 Mummy Sleeping Bag is #9 cheapest of the 17 sleeping bags we track, where the median is $249.95.
Has the Sidewinder SL 20 Mummy Sleeping Bag's price dropped?
Yes — since 2026-06-27 the Sidewinder SL 20 Mummy Sleeping Bag has fallen 20%, from $249.95 to $199.96.
What is the lowest price the Sidewinder SL 20 Mummy Sleeping Bag has been?
The lowest we have recorded for the Sidewinder SL 20 Mummy Sleeping Bag is $199.96 on 2026-07-26 — which is its current price.
Is now a good time to buy the Sidewinder SL 20 Mummy Sleeping Bag?
At $199.96, the Sidewinder SL 20 Mummy Sleeping Bag is at the lowest price we have recorded since 2026-06-27.
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.
Price of record: $199.96 at bigagnes.com, 2026-07-26. Other retailers may be lower — check the current price:
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