---
title: "Sea To Summit Spark III"
name: "Sea To Summit Spark III"
brand: "Sea To Summit"
description: "The Spark III from Sea To Summit is an ultra-lightweight three-season down sleeping bag with a total weight of just 665 grams."
handle: "sea-to-summit-spark-3"
sku: "ASP3-L"
ean: "9327868095018"
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md_url: "/p/sea-to-summit-spark-3.md"
locale: "en"
market: "eu"
currency: "EUR"
price: 439.4
price_formatted: "€439.40"
availability: "OutOfStock"
item_condition: "NewCondition"
category: "Sleeping bags"
category_path: "/c/sleep/sleeping-bags"
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  - name: "Sea To Summit Spark III"
    url: "/p/sea-to-summit-spark-3"
last_updated: "2026-07-05"
---

# Sea To Summit Spark III

Brand: Sea To Summit · Category: [Sleeping bags](/c/sleep/sleeping-bags.md)
Sleeping bag size: Long, Regular · Zipper position: Left · Chamber design: H-shaped chambers

## Offer

- Price: €439.40
- Availability: Out of stock
- Condition: New
- Buy on the website: [HTML product page](/p/sea-to-summit-spark-3)

## Description

The Spark III from Sea To Summit is an ultra-lightweight three-season down sleeping bag with a total weight of just 665 grams. It is filled with 430 grams of high-quality down with a fill power of 850+ cuin and a hydrophobic treatment Ultra-Dry. The sleeping bag is constructed from lightweight and highly packable 10D nylon.

Easily packable three-season sleeping bag with hydrophobic down for ultralight enthusiasts.

## Materials

The filling of the sleeping bag consists of **premium 430 grams of down with a fill power of 850+ cuin** and an **Ultra-Dry water-repellent treatment**. The down used is approximately **98% goose and 2% duck**. The down has a certificate [Responsible Down Standard](https://textileexchange.org/responsible-down-standard/) (RDS). The temperatures for the sleeping bag are determined according to the European standard EN13537.

**Ultra-Dry Down is a water-repellent treatment** free of harmful substances PFC or PFAS. It is applied to down feathers during processing. Hydrophobic down feathers are not waterproof, but they absorb less water than untreated down feathers and dry much faster. Ultra-Dry Down does not affect the loft, lifespan, or breathability of the down feathers. The treatment lasts for at least 20 washes.

The construction of the sleeping bag uses **Ultralight 10D Nylon fabric**, which has excellent compressibility, is lightweight, and surprisingly durable. On the inside, an even lighter **7D nylon material** is used, which feels nice to the touch. The outer side is coated with a **durable water-repellent (DWR) treatment** that holds back light condensation or a few droplets of water.

## Construction

The sleeping bag has a **mummy shape**. Even though it is a true ultralight, the sleeping bag is relatively spacious.

Spark II features a **hybrid chamber construction**. The upper half of the sleeping bag features longitudinal box chambers construction (with vertical walls), which prevents unwanted down from shifting to the sides. The lower half of the sleeping bag has transverse chambers with sewn through construction.

The **Regular size** has a shoulder width of 77,5 cm, 67,5 cm at the hips, and 47 cm at the feet, suitable for individuals up to 183 cm tall. **The fill weight is 430 grams and the total weight is 665 grams.**

The **Long size** has a shoulder width of 81 cm, 71 cm at the hips, and 50 cm at the feet, suitable for people up to 198 cm tall. **The fill weight is 485 grams and the total weight is 745 grams.**

## Features

The sleeping bag has a **zipper on the left side** that extends **almost to the feet**. The zipper used is from the YKK brand #5 with two sliders for better ventilation. The zipper is secured at the top with a snap to prevent it from separating or scratching the chin.

The zipper is covered on the inside by a **down-filled insulating tube**. The last chamber at the neck is filled with a larger amount of down to minimize possible warmth loss.

The Spark sleeping bags have **adjustable hoods** and **neck collars with drawstrings**.

**QuiltLock System** – the sleeping bag is equipped with loops on the sides for attaching any Sea To Summit quilt. By combining the sleeping bag and quilt, you can take their use and performance to a whole new level.

## Accessories

A **compressing sack Ultra-sil** (45 g) is included with the sleeping bag. You will also receive a **special storage bag for long-term storage** of the sleeping bag at home.

The dimensions of the **Regular size** after compression are Ø 15,5 x 24 cm (4,6 l). The size of the supplied compression sack is XS.

The size dimension for **Long size** after compression is ø 15,5 x 29 cm (5,4 l). The size of the supplied stuff sack is XS.

## Specs

- Color: Grey / Yellow
- Sleeping bag size: Long, Regular
- Zipper position: Left
- Chamber design: H-shaped chambers
- Down-to-feather ratio: 90/10 (feather/down)
- Season: 3-season
- Comfort temperature: -2 °C
- Limit temperature: -8 °C
- Down weight: 430 g, 485 g
- Fill power: 850 cuin
- Down type: Goose
- Hydrophobic down: Yes
- Insulation type: Down
- Material: YKK 5 mm zip, 10D nylon with DWR, 7D nylon
- Packed dimensions: 29 × 15.5 × 15.5 cm, 24 × 15.5 × 15.5 cm
- Stuff sack volume: 4.6 l, 5.4 l
- Ankle width: 47 cm, 50 cm
- Hip width: 67.5 cm, 71 cm
- Shoulder width: 77.5 cm, 81 cm, 77 cm
- Weight: 745 g
- Brand: Sea To Summit

## Variants

- Sea To Summit Spark III - Long · SKU ASP3-L · EAN 9327868095018 · €481.70 · Out of stock · Long, Grey / Yellow
- Sea To Summit Spark III - Regular · SKU ASP3-R · EAN 9327868095001 · €439.40 · Out of stock · Regular, Grey / Yellow

## Related

- [Cumulus Teneqa 700](/p/cumulus-teneqa-700.md)
- [Sea To Summit Aeros Premium Pillow (2026)](/p/sea-to-summit-aeros-premium-pillow-2026.md)
- [Cumulus Teneqa 850](/p/cumulus-teneqa-850.md)
- [Sea To Summit Lightweight Dry Bag](/p/sea-to-summit-lightweight-dry-bag.md)
- [Patizon G 800](/p/patizon-g800.md)
- [Sea To Summit eVac Compression Dry Bag](/p/sea-to-summit-evac-compression-dry-bag.md)
- [Patizon G 1100](/p/patizon-g1100.md)
- [Sea To Summit Ultra-Sil Dry Bag](/p/sea-to-summit-ultra-sil-dry-bag.md)

## Shipping and returns

- [Shipping and payment](/shipping-payment)
- [Returns](/return-order)

## Images

- ![Sea To Summit Spark III](https://media.gramino.com/medusa/ab9a6a596322f39483cc864b96a6e19e-01KWHVMWWAN73RTDJ5K8PFV2Q6.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/71a7ec1467358d4d300a4046a390f32c-01KWHVMWWC7F0Z2E3PVQPQF39M.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/63be270e4de14cf144cb0421045b5546-01KWHVMWXMR9DK3BRBF4S23CDH.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/d323e1cba97d4c04737377a30db87101-01KWHVMWYKYAC3CG34QEDPZ9EJ.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/6eddb740be9e2933fd817dfa727ba7b7-01KWHVMX289VCAX2YDQ48VM285.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/a8dc068ef0823b61b714eb5aacfcf1c5-01KWHVMX1TV4497VKHX66FR43Y.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/1b5fdad17dab4d4a3b226f53d39fe5a6-01KWHVMX29BSDGN6Q19XWCBDK7.jpg)
- ![Sea To Summit Spark III](https://media.gramino.com/medusa/7c8271e69495b0ed780c68c6e6252336-01KWHVMX4NG8DZDY0Q6991DPRH.jpg)

## Identifiers

- SKU: ASP3-L
- EAN: 9327868095018
- Handle: sea-to-summit-spark-3
- Brand: Sea To Summit

This product is also available as [HTML](/p/sea-to-summit-spark-3).

Category: [Sleeping bags](/c/sleep/sleeping-bags.md) · [Sitemap](/sitemap.md)

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