Coreplex · Brands · Sea to Summit
Spark Down Sleeping Bag
Spark Down Sleeping Bag by Sea to Summit costs $349.00 for Temp rating: 45°F, Size: Regular at Sea to Summit, the brand's official store, as of October 18, 2026. Returns: 60 days from purchase to request a return; opened or used items are not accepted; excluded: final sale. Checkout happens on the seller's own store; Coreplex adds no fees.
At a glance
| Brand | Sea to Summit |
|---|---|
| Sold by | Sea to Summit (the brand's official store) |
| Price | $349.00 for Temp rating: 45°F, Size: Regular |
| Price checked | October 18, 2026, before tax and shipping. The live page and the seller's store have the current price. |
| Availability | In stock at the seller when checked |
| Condition | new |
| Size options | Long, Double (sold out), Regular |
| Temp rating options | 0°F (sold out), 15°F (sold out), 30°F, 45°F |
| Rating | 4.8 of 5 from 771 reviews on the seller's store |
| Shopify catalog ID | 4J1ZUAOuSQtTMDt6NnajVp |
Shipping and returns
Returns, refunds and shipping follow Sea to Summit's own policy, not Coreplex's. Read it before buying, especially for opened, hygiene or final-sale items.
In short: 60 days from purchase to request a return; opened or used items are not accepted; excluded: final sale.
| Term | Sea to Summit's policy | Exact wording |
|---|---|---|
| Return window | 60 days | You can return an item for a full refund within 60 days of your purchase date. |
| Window counts from | purchase | You can return an item for a full refund within 60 days of your purchase date. |
| Item condition | unused, original packaging | All items must be returned in the original, unused condition and must include all original packaging. |
| Opened items | not accepted | If you are doing a return and the original card you used to purchase the item is no longer in working order the refund will still post to the account associated with the credit card. |
| Not returnable | final sale | Final sale items cannot be returned. |
| Refund goes to | original payment method | Please allow 7-10 days for refunds to process through your original form of payment. |
| Refund timing | 60 days | You can return an item for a full refund within 60 days of your purchase date. |
Read from Sea to Summit's refund policy on October 18, 2026. Terms the policy doesn't settle are left out rather than guessed.
Other stores selling it
Coreplex counts another store's listing as the same item only when it shares a Shopify catalog ID or barcode with this one; lookalikes are shown as similar and never priced as equals. The live page runs that check now. AI agents can run it with the Coreplex MCP tools get_passport or compare_prices (product_url: https://seatosummit.com/products/spark-down-sleeping-bag).
What Sea to Summit says
Spark Down Sleeping Bag If you're counting grams, but still count on a great night's sleep, the Spark may be the right bag for you. Filled with RDS-certified 850+ fillpower goose down treated with a non-PFAS Ultra-Dry Down treatment, the Spark is constructed with a technical hood and zipper draft tube to retain warmth. Comfort comes from a super-breathable 10 denier liner fabric, while a 10D shell with a non-PFAS DWR plus a highly water repellent hood and footbox fabric shed wind and condensation. The full-length zipper model can be zipped to an equivalent Women's Spark for comfort that couples can share Tech Specs Materials Shell: 100% nylon Lining: 100% nylon Down Fill: 90/10 Goose Down Stuff Sack: 100% nylon - excluding trims Insulation RDS-certified, 850+ fillpower goose down with a non-PFC Ultra-Dry Down treatment Specifications by Temp Rating & Size Temp Rating & Size Weight Packed Weight Dimension Packed Size Compressed Volume Length Recommended User Height Fill Weight Temp Rating (ISO Lower) Temp Rating (ISO Comfort) 45°F / Regular 363 g | 12.8 oz 398 g | 14.0 oz 196 x 77.5 cm | 77.2 x 30.5 in 23 x 12.5 x 9 cm | 9 x 5 x 4 in 2 L 196cm | 77in 185 cm | 72.83 in 150 g | 5.29 oz 7 °C | 45 °F 11 °C | 52 °F 45°F / Long 387 g | 13.7 oz 422 g | 14.9 oz 211 x 82.5 cm | 83.1 x 32.5 in 24 x 15 x 10 cm | 9 x 6 x 4 in 2.9 L 211cm | 83in 198 cm | 77.95 in 172 g | 6.07 oz 7 °C | 45 °F 11 °C | 52 °F 30°F / Regular 493 g | 17.4 oz 558 g | 19.7 oz 196 x 77.5 cm | 77.2 x 30.5 in 34 x 19.5 x 13.5 cm | 13 x 8 x 5 in 4.5 L 196cm | 77in 185 cm | 72.83 in 265 g | 9.35 oz -1 °C | 30 °F 4 °C
Frequently Asked questions (from the seller's page)
Can I open a Spark flat for use as a quilt? No - the ultralight Spark does not have a footbox zipper. For this feature, see the Spark Pro or Ascent sleeping bags
Materials (from the seller's page)
Shell: 100% nylon; Lining: 100% nylon; Down Fill: 90/10 Goose Down; Stuff Sack: 100% nylon - excluding trims Insulation RDS-certified, 850+ fillpower goose down with a non-PFC Ultra-Dry Down treatment 45°F Regular 45°F Long 30°F Regular 30°F Long 15°F Regular 15°F Long 15°F Double 0°F Regular 0°F Long Weight 363 g 12.8 oz 387 g 13.7 oz 493 g 17.4 oz 536 g 18.9 oz 730 g 25.7 oz 786 g 27.7 oz 1543 g 54.4 oz 1113 g 39.3 oz 1204 g 42.5 oz Fill Weight 150 g 5.3 oz 172 g 6.1 oz 265 g 9.3 oz 305 g 10.8 oz 480 g 16.9 oz 540 g 19.0 oz 985 g 34.7 oz 840 g 29.6 oz 945 g 33.3 oz Compressed Volume 2 L 2.9 L 4.5 L 5.1 L 6.8 L 7.6 L 14.3 L 9.9 L 10.6 L Temperature Rating (ISO Lower) 7 °C 45 °F 7 °C 45 °F -1 °C 30 °F -1 °C 30 °F -9 °C 16 °F -9 °C 16 °F -9 °C 16 °F -18 °C 0 °F -18 °C 0 °F Women's Temperature Rating (ISO Comfort) 11 °C 52 °F 11 °C 52 °F 4 °C 39 °F 4 °C 39 °F -2 °C 28 °F -2 °C 28 °F -2 °C 28 °F -10 °C 14 °F -10 °C 14 °F Recommended User Height 185 cm 6 ft 1 in in 198 cm 6 ft 6 in in 185 cm 6 ft 1 in in 198 cm 6 ft 6 in in 185 cm 6 ft 1 in in 198 cm 6 ft 6 in in 198 cm 6 ft 6 in in 185 cm 6 ft 1 in in 198 cm 6 ft 6 in in Imperial Metric
Key features (from Shopify's product catalog)
- RDS certified 850 FillPower goose down: Delivers high warmth and energy return for superior insulation
- Non-PFAS Ultra Dry down treatment: Enhances water resistance and environmental sustainability
- Technical hood and anatomical footbox: Retain warmth and keep out wind and moisture
- 10D nylon shell with non-PFAS DWR: Provides lightweight, highly water-repellent protection
- Breathable 10D liner fabric: Prevents overheating and sheds wind and condensation
| Fill | RDS certified 850 FillPower goose down |
|---|---|
| Down Treatment | Non-PFAS Ultra Dry |
| Shell Material | 10D nylon with non-PFAS DWR |
| Liner Material | 10D nylon |
| Insulation | RDS certified 850 FillPower goose down with non-PFAS Ultra Dry treatment |
| Sizes | Regular, Long, Double |
| Weight | 363 g (Regular), 493 g (Long), 730 g (Double) |
| Temperature Ratings | 45°F (30°C), 30°F (15°C), 15°F (7°C), 0°F (-18°C), 7°C |
Summarized by Shopify's catalog and checked by Coreplex against the seller's own text: claims the seller's text contradicts are left out. Confirm details with Sea to Summit.
What Coreplex could not confirm
- Brand confirmation from the brand itself. The brand has not claimed this listing on Coreplex.
- Whether other stores sell this exact item. Coreplex only calls two listings the same item when they share a Shopify catalog ID or a barcode.
- Independent evidence for claims in the listing. Claims are the seller's own.
- A barcode (GTIN) for this listing. Without one, price comparisons with other stores are only possible through Shopify's own catalog grouping.
- Prices for the other options: the price above is for the option shown only.