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Description

The Spark Ultralight Mummy Sleeping Bag Series is designed for every type of adventure—from lightweight liners for summer trips to warm, packable bags that will keep you cozy through chilly winter nights. Crafted with premium materials and a focus on performance, these bags simplify your experience without compromising on quality.

Ultralight does not mean cramped; the Spark’s snug mummy shape is engineered to retain heat while providing enough space for comfortable movement after a long day on the trail. It is ideal for fast-moving backcountry explorers who aim to carry no more than necessary.

850+ FILL Power, RDS-certified
Goose Down with Ultra Dry Down treatment for enhanced water resistance in damp conditions.
10-Denier Nylon shell and lining.
10-Denier Nylon waterproof-breathable hood and footbox.
Mummy Fit: Fitted cut with a generous footbox and technical hood, maximizing thermal efficiency while minimizing bulk and weight.
Spark 7C/45F & 1C/30F Primary zip - 1/2 length #5 with zip-plow and two sliders.
Spark -9C/15F & -18C/0F Primary zip - 3/4 length #5 with zip-plow and two sliders.
Vertical chest baffles, horizontal baffles, lower half, and base.
SPARK 7C features sewn-through quilted construction throughout.
SPARK -1C/30F includes box wall baffles in the top half and sewn-through quilted construction in the lower half.
SPARK -9C & -18C employs box wall baffle construction throughout.
Spark 7C, -1C & -9C has a standard front draft collar.
SPARK -18C includes double draft collars.
Spark 7 & -1 cannot be paired.
Spark -9 & -18: Pairs with Women's Sea to Summit bags.
QuiltLock System integrates with StS quilts.
Best Use: Ultralight Backpacking.
Comes With: Ultra-Sil compression bag and storage cell.
Insulation: Ultra-Dry Goose Down 850+ Loft.
Material(s): 10-Denier Nylon shell and lining, 10

Delivery

Standard Delivery (£4.99)

FREE on orders over £95.00

A tracking link will be provided once your order is despatched

*Certain items such as bikes and other large items do not qualify for free delivery. In these cases the available delivery options will be shown at checkout.

Next Day Delivery (£5.99)

Order by 5pm. Delivered by Evri or DHL between 8am and 8pm Monday-Saturday, excluding Bank Holidays. Cannot be offered in the following areas, and will be attempted within 48 hours: BT (all Northern Ireland), GY, IM, JE, KW11-17, HS, PH32-35, ZE.

Certain items such as bikes do not qualify for next delivery. In these cases Next Day Delivery will not be available in the checkout.

Click and Collect

Select a store, and if your items are available in that store then you can pay now and collect the same day. If the item is not available in-store, we will deliver them to the store from our warehouse in 3-5 days.
You will be notified when your order is ready to collect. Please do not travel to store until you have been notified. Orders will be kept in store for 14 days before being cancelled.