# 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

| Field | Value |
| --- | --- |
| 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 |

Buy at Sea to Summit: https://seatosummit.com/products/spark-down-sleeping-bag

## Shipping and returns

Returns, refunds and shipping follow Sea to Summit's own policy, not Coreplex's.

In short: 60 days from purchase to request a return; opened or used items are not accepted; excluded: final sale.

| Term | 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 the seller's refund policy on 2026-10-18.

- Refund policy: https://checkout.shopify.com/24672501/policies/1317961756.html
- Shipping policy: https://checkout.shopify.com/24672501/policies/25417351341.html

## Other stores selling it

Coreplex counts another listing as the same item only when it shares a Shopify catalog ID or barcode; lookalikes are never priced as equals. Live check: https://coreplex.ai/p/seatosummit.com/spark-down-sleeping-bag · MCP: get_passport / compare_prices with 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

| Spec | Value |
| --- | --- |
| 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 |

## 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.

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Source: Sea to Summit's public Shopify listing, read 2026-10-18. Cite as: Coreplex, "Spark Down Sleeping Bag", https://coreplex.ai/p/seatosummit.com/spark-down-sleeping-bag.html