Sea to Summit Spark SpI Ultralight Sleeping Bag 5°C ASP1-R

The Spark Ultralight Mummy Sleeping Bag Series spans everything from an ultralight down-filled liner, to a mid-winter fast-and-light sleeping bag. Each model uses premium materials and no-frills design to provide cutting-edge performance.

Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user.

Features

ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Goose Down certified Responsible Down Standard (RDS)

10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size

Includes lightweight Ultra-Sil compression bag and storage cell

QUESTIONS

Suitable for cooler temperatures?

Yes. The 5°F or possibly the 18°F will work in late Fall. The Spark 5°F will take you down to winter temperatures when paired with a greater than 3.5 R-Value sleeping mat like the Comfort Light Insulated.

Really suitable as a sleeping bag liner?

Yes. You could use the Spark 50°F, or even the Spark 40°F to boost the performance of a bag for cold-weather use. Adding one of these to a 20°F bag might make more sense than buying a 0°F bag for occasional winter use.

Able to be zipped to another sleeping bag?

No. Even though the 18°F or 5°F have full-length side zippers, they are not designed to be coupled to a sleeping bag with a right zipper (for instance the Flame 18°F or 5°F).

You have more questions?

Check out our FAQ page HERE and discover even more answers about our products.

Zipper-length trimmed for gram-saving performance:

1/3-length zippers

Baffle construction:

have sewn-through construction

Shape:

Contoured mummy

BEST USE

Ultralight Backpacking

COMES WITH

Ultra-Sil compression bag and storage cell

INSULATION

Ultra-Dry Down 850+ Loft

SHAPE

Mummy

SHELL FABRIC

Ultralight 10D Nylon Shell