What Is the Lightest 30 Degree Sleeping Bag in 2026?

The lightest 30 degree sleeping bag on this shelf of seven models is the Sea to Summit Spark Pro 30 at 480 g (16.9 oz, 1.06 lb), lighter than 100% of the shelf. The median weight across the shelf is 1089 g (38.4 oz, 2.40 lb), matched exactly by the Mountain Hardwear Bishop Pass 30F Down at $315. Reaching the lightest bag costs $549, and each ounce it saves against the median runs $8.61 per ounce saved. The spread from lightest to heaviest is 830 g (29.3 oz, 1.83 lb), so the shelf covers real range, not a rounding error.

Going lighter costs real money: the Spark Pro 30's $32.42 per ounce is the highest price per ounce on the shelf, and its $8.61 per ounce saved against the median is a steeper price than the Therm-a-Rest Vesper Quilt 32F's $3.92 per ounce saved. Every model here except the Vesper Quilt carries the same 30°F rating, so weight and price, not warmth, are what separate them.

The picks, with their figures

1. Lightest overall

   Sea to Summit Spark Pro 30

   1.06 lb · #1 of 7 · lighter than 100% of the shelf · $549.00 · $32.42/oz

   At 480 g (16.9 oz, 1.06 lb) the Spark Pro 30 is lighter than 100% of the shelf. It costs $549, or $32.42 per ounce, and each ounce it saves against the shelf's 1089 g median runs $8.61 per ounce saved. It carries a 30°F rating, matching most of the shelf.

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2. Lightest under $500

   Therm-a-Rest Vesper Quilt 32F

   1.19 lb · #2 of 7 · lighter than 83% of the shelf · $439.95 · $23.10/oz

   The Therm-a-Rest Vesper Quilt 32F weighs 540 g (19.0 oz, 1.19 lb) and costs $440, the lightest option the shelf lists under $500. That works out to $23.10 per ounce, with each ounce saved against the median costing $3.92 per ounce saved. It carries a 32°F rating, the only rating on the shelf other than 30°F.

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3. Lightest under $350

   Mountain Hardwear Bishop Pass 30F Down

   2.40 lb · #4 of 7 · lighter than 50% of the shelf · $314.99 · $8.20/oz

   The Mountain Hardwear Bishop Pass 30F Down weighs 1089 g (38.4 oz, 2.40 lb), the exact median weight of the shelf, and at $315 it is the lightest bag listed under $350. Its price per ounce, $8.20, sits under the shelf median of $8.62 per ounce. It is lighter than 50% of the shelf and rated to 30°F.

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4. Lightest under $250

   Sea to Summit Hamelin Synthetic Sleeping Bag

   2.69 lb · #6 of 7 · lighter than 17% of the shelf · $196.00 · $4.55/oz

   The Sea to Summit Hamelin Synthetic Sleeping Bag weighs 1220 g (43.0 oz, 2.69 lb) and costs $196, the lightest bag the shelf lists under $250. At $4.55 per ounce it is priced well below the shelf median of $8.62 per ounce. It is lighter than 17% of the shelf and rated to 30°F.

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5. Lightest under $150

   Sea to Summit Boab Synthetic Sleeping Bag

   2.89 lb · #7 of 7 · lighter than 0% of the shelf · $124.00 · $2.68/oz

   The Sea to Summit Boab Synthetic Sleeping Bag is the cheapest bag with a listed price on the shelf, $124, and the lightest option under $150 at 1310 g (46.2 oz, 2.89 lb). Its $2.68 per ounce is the lowest price per ounce on the shelf, though it is lighter than 0% of the shelf, the heaviest bag listed. It is rated to 30°F.

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How to read this shelf

This shelf holds seven 30-degree sleeping bags and quilts, part of the 24 sleeping bags and quilts RidgeNote tracks. The median weight here is 1089 g (38.4 oz, 2.40 lb), matched exactly by the Mountain Hardwear Bishop Pass 30F Down. "Lighter than" the shelf is a straight percentile: the Sea to Summit Spark Pro 30 is lighter than 100% of the shelf, and the Sea to Summit Boab Synthetic Sleeping Bag, at the opposite end, is lighter than 0%.

The full spread from lightest to heaviest runs 830 g (29.3 oz, 1.83 lb), the difference between the 480 g Spark Pro 30 and the 1310 g Boab Synthetic. Six of the seven models on this shelf carry a 30°F rating; only the Therm-a-Rest Vesper Quilt 32F carries a different rating, at 32°F. Reading rank alongside price and price per ounce together, rather than weight alone, is how to see what each step down the shelf actually buys or costs.

The weight-for-money trade

At each price ceiling the lightest available option changes. Under $150, the lightest is the Sea to Summit Boab Synthetic Sleeping Bag at $124. Under $250, it's the Sea to Summit Hamelin Synthetic Sleeping Bag at $196. Under $350, the Mountain Hardwear Bishop Pass 30F Down at $315 takes over, and it happens to sit exactly at the shelf's median weight, 1089 g. Under $500, the Therm-a-Rest Vesper Quilt 32F at $440 is the lightest listed, and under $750 the Sea to Summit Spark Pro 30 at $549 is both the lightest at that ceiling and the lightest on the entire shelf.

Price per ounce climbs sharply as weight drops. The Boab Synthetic runs $2.68 per ounce, the Hamelin Synthetic $4.55, the Bishop Pass $8.20, the Vesper Quilt $23.10, and the Spark Pro 30 $32.42. Where a model beats the median weight of 1089 g, the spine also states what each ounce saved costs: $8.61 per ounce saved for the Spark Pro 30, $3.92 per ounce saved for the Vesper Quilt, and $7.99 per ounce saved for the Sea to Summit Trek 30-Degree Down. Past the Vesper Quilt's $440, the money buys steadily less weight reduction per dollar.

The middle of the shelf

Around the median, moving one rank changes both grams and dollars by a real amount. The Mountain Hardwear Bishop Pass 30F Down sits at rank #4, 1089 g (38.4 oz) for $315. One rank lighter, the Sea to Summit Trek 30-Degree Down sits at rank #3, 720 g (25.4 oz) for $468, lighter than 67% of the shelf against the Bishop Pass's 50%. One rank heavier, the Sea to Summit Trek Down Sleeping Bag sits at rank #5, 1197 g (42.2 oz) for $364, lighter than 33% of the shelf.

The Sea to Summit Trek 30-Degree Down costs $468, above the shelf's median price of $364, while the Sea to Summit Trek Down Sleeping Bag costs exactly $364, the median price, for a heavier build at 1197 g against the Trek 30-Degree Down's 720 g. The Sea to Summit Hamelin Synthetic Sleeping Bag, at rank #6, weighs 1220 g for $196, lighter than 17% of the shelf, well below the median price on both weight and price at once.

Who should not buy the lightest

The Spark Pro 30, at 480 g and $549, is lighter than 100% of the shelf, but the figures on this page cannot say how any bag will actually keep a given sleeper warm at a given temperature, how it will fit a longer or broader frame, or how its loft will hold up after repeated use. A reader whose priority is a lower price rather than a lower number on the scale has other models on this shelf, from the $124 Boab Synthetic to the $364 Trek Down Sleeping Bag, both rated to the same 30°F.

Anyone deciding between the lightest bag and a heavier one should weigh the price per ounce saved against what that weight actually costs on the trail, not just at checkout. The 30°F or 32°F rating on every model here is a maker's published figure, not a measured outcome, and only the reader's own sleep habits, clothing, and tolerance for cold can say whether a given rating, at a given weight, is enough.

Every model on this shelf, lightest first

7 30 °F sleeping bags and quilts. Median 2.40 lb, median price $364.00, median $8.62 per ounce.

The whole category, every model placed: the sleeping bags & quilts measured.

What we did not measure

How the stated 30°F or 32°F rating feels to an individual sleeper: metabolism, sleep system, and clothing worn inside the bag all shift a published rating in practice, so judge this against your own cold tolerance, not the number alone.

Fit and cut, including shoulder and foot room: the spine does not carry those dimensions, so check a maker's own size chart or try a bag before buying.

Durability and loft retention over repeated compression and years of use: a spec sheet captures day-one weight, not what a bag looks or lofts like after many nights.

Weather performance such as draft resistance or behavior in damp conditions: the register does not carry fill type, shell fabric, or baffle construction, so none of those attributes appear on this page.

Packed size and how easily a bag compresses into a stuff sack: not part of the weight and price figures tracked here.

Questions people ask

When is a 30 degree bag enough?

A 30°F rating is a maker-published number, not a personal comfort guarantee. Every model on this shelf carries a 30°F rating except the Therm-a-Rest Vesper Quilt 32F, so match the number to the coldest night you expect and build in your own margin, since the spine cannot say how it will feel.

How much does a 30 degree quilt weigh?

The one quilt on this shelf, the Therm-a-Rest Vesper Quilt 32F, weighs 540 g (19.0 oz, 1.19 lb) and costs $440, the lightest option listed under $500.

What is the lightest 30 degree sleeping bag?

The Sea to Summit Spark Pro 30 is the lightest at 480 g (16.9 oz, 1.06 lb), lighter than 100% of the shelf, at $549.

What is the cheapest 30 degree bag?

The Sea to Summit Boab Synthetic Sleeping Bag is the cheapest with a listed price at $124, weighing 1310 g (46.2 oz, 2.89 lb).

Is it worth paying more to save weight?

The Spark Pro 30 saves weight against the median at $8.61 per ounce saved, while the Vesper Quilt 32F saves weight at $3.92 per ounce saved, so the cost of each gram varies sharply by model. Compare the per-ounce-saved figure for the specific pair you're weighing before deciding.