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Can I zip two Sea to Summit sleeping bags together?

Can I zip two Sea to Summit sleeping bags together?

Zipping two compatible sleeping bags together forms a warm, cozy, comfortable sleep environment for two people. This is a far more flexible option than a double sleeping bag (which explains why there are so few double sleeping bags on the market).

Here is an example of what zipper coupling looks like using our previous year's sleeping bags, the 2023 Ascent and 2023 Women's Altitude. 

 

BUT not all sleeping bags can be zipped together. Below you will find a table which details which Sea to Summit bags can be coupled – there are notes at the bottom which provide further clarification about which side zipper is referred to in the table (and give some caution about zipping non-Sea to Summit sleeping bags to Sea to Summit models).

 

Current Sleeping Bags

Model Year Zip Side/Type Zip Compatibility
Alpine 2024 Left #5 None
Spark 45°F  2024 Left #5 None
Spark 30°F 2024 Left #5 None
Spark 15°F 2024 Left #5

Women's Spark 15°F 

Any STS bag w/ a Right #5 zip

Spark 0°F 2024 Left #5

Women's Spark 15°F 

Any STS bag w/ a Right #5 zip

Women’s Spark  45°F 2024 Right #5 None
Women’s Spark  30°F 2024 Right #5 None
Women’s Spark  15°F 2024 Right #5 Any STS bag w/ a Left #5 zip
Spark Pro 2024 Left #5 Any STS bag w/ a Right #5 zip
Ascent 2024 Left #5 Any STS bag with a Right #5 zip
Women's Ascent 2024 Right #5 Any STS bag with a Left #5 zip
Trek 2024 Left #5 Any STS bag with a Right #5 zip
Women's Trek 2024 Right #5 Any STS bag with a Left #5 zip
Basecamp 2024 Left and Right #5

Basecamp

Any STS bag with a Right #5 zip
Traveller 2024 Left #5 2024 Traveller w/ the same zip length
Traverse TV 2019-2024 Left #5 Any STS bag w/ a Right #5 zip
Venture 2019 - 2024 Right #5 Any STS bag with a Left #5 zip
Trailhead 2019-2024 Left #5 None
Quest 2019 - 2024 Right #5 None

 

Past Sleeping Bags

 Model Year Zip Side/Type Zip Compatibility 
Alpine 2010-2023 Left #5 None
Spark I 2015 – 2023 Left #3 None
Spark II 2017 - 2023 Left #3 None
Spark III 2017 – 2018 Left #3 None
Spark III 2019 - 2022 Left #3 Any STS bag with a Right #5 zip
Spark IV 2019 - 2022 Left #3 None
Spark IV 2023 Left # 5 Any STS bag with a Right #5 zip
Flame I 2015 – 2023 Right #3 None
Flame II 2017 - 2023 Right #3 None
Flame III 2017 – 2018 Right #3 None
Flame III 2019 - 2022 Right #3 None
Flame III 2023 Right #5 Any STS bag with a Left #5 zip
Flame IV 2019 - 2022 Right #3 None
Flame IV 2023 Right #5 Any STS bag with a Left #5 zip
Ascent 2019 – 2023 Left # 5 Any STS bag with a Right #5 zip
Altitude 2019-2023 Right #5 Any STS bag with a Left #5 zip
Trek 2010-2023 Left #5 Any STS bag with a Right #5 zip
Women's Trek 2016-2018 Right #5 Any STS bag with a Left #5 zip
Traverse XT 2010-2016 Left #5 Any STS bag with a Right #5 zip
Micro 2010-2016 Left or right #3 Only 2010-2016 Micro with opposite zipper side
Micro 2017 - 2018 Left or right #5 Any STS bag with opposite zipper side #5 zip
Traveller 2016 – 2023 Left #3 Another 2016 – 2023 Traveller of the same length
Talus 2012-2018 Left #5 Any STS bag with a Right #5 zip
Latitude 2016-2018 Left #5 Any STS bag with a Right #5 zip
Women's Talus 2016-2018 Right #5 Any STS bag with a Left #5 zip
Women's Latitude 2016-2018 Right #5 Any STS bag with a Left #5 zip
Amplitude 2019-2022 left and right #5 Another Amplitude/Basecamp or any STS bag with a #5 zip

Note - in the above table, the zipper referred to is the main side zipper. Some bags also have a footbox zipper; some have a secondary short side zipper. The zipper used to couple two sleeping bag together is always the main side zipper. 

The zipper descriptions relate to Sea to Summit sleeping bags. A sleeping bag from another brand may zip together with a Sea to Summit bag provided the zipper is the same size and has the same teeth oriented in the same way facing inwards. In case of doubt when trying to couple two bags, do not force a zipper slider - damage can result to the zipper slider or zipper track.

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