All Spark sleeping bags are characterised by their ultra-light weight, minimal packing size and excellent thermal performance. The SpIV features vertical boxing compartments that are stitched throughout to provide extra moisture and reduce cold bridges. The expedition size provides extra space for additional layers of clothing. The vertical chambers in the chest area optimize the distribution of the down and prevent slipping. A full-sided zipper with two sliders allows easy access and variable ventilation. A zipper channel, a hood and a heat collar prevent heat loss. Ultra Dry DownUltraDry Down is a PFC-free water-repellant treatment applied to the down used in all Sea to Summit sleeping bags. UltraDry Down retains over 60 % more loft, absorbs 30 % less moisture and dries out 60 % faster when compared to untreated down – which means the down will insulate better even in damp conditions. The treatment also inhibits bacterial growth, making your bag last longer. UltraDry Down treatment is an environmentally friendly application.
All Spark sleeping bags are characterised by their ultra-light weight, minimal packing size and excellent thermal performance. The SpIV features vertical boxing compartments that are stitched throughout to provide extra moisture and reduce cold bridges. The expedition size provides extra space for additional layers of clothing. The vertical chambers in the chest area optimize the distribution of the down and prevent slipping. A full-sided zipper with two sliders allows easy access and variable ventilation. A zipper channel, a hood and a heat collar prevent heat loss. Ultra Dry DownUltraDry Down is a PFC-free water-repellant treatment applied to the down used in all Sea to Summit sleeping bags. UltraDry Down retains over 60 % more loft, absorbs 30 % less moisture and dries out 60 % faster when compared to untreated down – which means the down will insulate better even in damp conditions. The treatment also inhibits bacterial growth, making your bag last longer. UltraDry Down treatment is an environmentally friendly application.
in 2 offers
The lowest price for Sea to Summit Spark Spiv Sleeping Bag (Regular) right now is $597.47 at Snowys Outdoors, compared across 2 retailers.
The all-time low was $539.40 on 10 Feb 2025 — today's price is 11% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 14 May 2026.
Sea to Summit Spark Spiv Sleeping Bag (Regular)
All Spark sleeping bags are characterised by their ultra-light weight, minimal packing size and excellent thermal performance. The SpIV features vertical boxing compartments that are stitched throughout to provide extra moisture and reduce cold bridges. The expedition size provides extra space for additional layers of clothing. The vertical chambers in the chest area optimize the distribution of the down and prevent slipping. A full-sided zipper with two sliders allows easy access and variable ventilation. A zipper channel, a hood and a heat collar prevent heat loss. Ultra Dry DownUltraDry Down is a PFC-free water-repellant treatment applied to the down used in all Sea to Summit sleeping bags. UltraDry Down retains over 60 % more loft, absorbs 30 % less moisture and dries out 60 % faster when compared to untreated down – which means the down will insulate better even in damp conditions. The treatment also inhibits bacterial growth, making your bag last longer. UltraDry Down treatment is an environmentally friendly application.
All Spark sleeping bags are characterised by their ultra-light weight, minimal packing size and excellent thermal performance. The SpIV features vertical boxing compartments that are stitched throughout to provide extra moisture and reduce cold bridges. The expedition size provides extra space for additional layers of clothing. The vertical chambers in the chest area optimize the distribution of the down and prevent slipping. A full-sided zipper with two sliders allows easy access and variable ventilation. A zipper channel, a hood and a heat collar prevent heat loss. Ultra Dry DownUltraDry Down is a PFC-free water-repellant treatment applied to the down used in all Sea to Summit sleeping bags. UltraDry Down retains over 60 % more loft, absorbs 30 % less moisture and dries out 60 % faster when compared to untreated down – which means the down will insulate better even in damp conditions. The treatment also inhibits bacterial growth, making your bag last longer. UltraDry Down treatment is an environmentally friendly application.
Last updated at 14/05/2026 21:48:52
Spark SP4 Sleeping Bag (-8 °C)
Free 60-day returns
Sea To Summit Spark Ultralight Sleeping Bag 5°F | -15°C Regular
| Snowys Comfort Rating | −8 °C |
| Lower Limit | −15 °C |
| Shape | Mummy |
| Max. User Height | 183 cm |
| Internal Girth | 155 cm Chest | 135 cm Hip | 94 cm Foot |
Spark SP4 Sleeping Bag (-8 °C)
Free 60-day returns
Sea To Summit Spark Ultralight Sleeping Bag 5°F | -15°C Regular
| Snowys Comfort Rating | −8 °C |
| Lower Limit | −15 °C |
| Shape | Mummy |
| Max. User Height | 183 cm |
| Internal Girth | 155 cm Chest | 135 cm Hip | 94 cm Foot |
