Western Mountaineering
Western Mountaineering AlpinLite 20
No citable owner-review average published for this one, so no stars.
The UltraLite cut wider: same 20-degree rating, same 5.5 inches of loft, five more inches of shoulder girth and three more ounces of down to fill the extra space. Two ounces of total weight is the whole cost of the upgrade, and for anyone who has felt pinned in an UltraLite it is the obvious choice. The 7'0" length is the only bag in this catalogue that fits someone genuinely tall without compromise.
Label against lab
No ISO or EN rating is published for this one — the 20 °F is Western Mountaineering’s own figure, with no lab test behind it. Where a maker publishes loft or fill weight instead, those are the numbers worth comparing. What the standards measure
At that temperature the pairing table wants at least an R 4 pad underneath it.
Size run
One product, 4 sizes. The headline numbers on this page describe the 6'0".
| Size | Weight | Approx. price | Length | Shoulder girth |
|---|---|---|---|---|
| 5'6" | 1 lb 13 oz | ~$740 | — | 63 in |
| 6'0" | 1 lb 15 oz | ~$765 | — | 64 in |
| 6'6" | 2 lb 1 oz | ~$790 | — | 65 in |
| 7'0" | 2 lb 4 oz | ~$815 | — | 65 in |
Specifications
Highlights
Features
- RDS down
- Draft collar
- Full-length zipper
- Made in USA
- Wide option
What it does well
- 64-inch shoulder girth against the UltraLite's 59, for two ounces and 19 ounces of down instead of 16.
- A 7'0" length option — the only bag here that fits someone over about six foot five properly.
- Same measured 5.5 inches of loft and same continuous-baffle construction as the UltraLite.
- Published girth, loft and fill weight for every one of the four lengths.
What it costs you
- $765 in the middle size, and $815 for the tallest.
- No ISO or EN rating.
- The extra volume is extra air to heat; a cold sleeper will not find it warmer than the UltraLite, just roomier.
- Untreated down, like the rest of the line.
Those two lists are drawn from Western Mountaineering’s published specifications and from reviews that measured them. They are not owner sentiment — anything owners said appears under its own heading below.
What owners say
Distilled from owner discussions and long-term published reviews, not from anything measured here.
The AlpinLite is the roomier sibling and the reports reflect that: owners talk about the feel of getting into it rather than about its numbers. One long-term owner's description — sliding into that big, puffy bag — is the tone of most of them.
The practical tip that comes with it is worth repeating. Even in a wide bag, rolling over can open a draft at the shoulder, and the suggested fix is a thin synthetic quilt draped over the top. That is a cheap upgrade that owners say makes a noticeable difference, and it applies to any down bag.
On value, owners comparing it with a heavier competitor at the same comfort rating and roughly the same price are blunt that the weight difference is not close.
What owners like
- Owners describe the pleasure of the roomy cut in unusually warm terms — sliding into a big, puffy bag is how one long-term owner puts it.
- Owners comparing it against heavier competitors at the same comfort rating and price point conclude it is the better bag by a wide margin on weight.
- It holds its value and turns up on the used market, which owners treat as a viable buying route.
- Years of ownership without complaint is the common pattern in the reports.
Common complaints
- Even in a roomy bag, owners report drafts when they roll over, and the fix suggested is draping a thin synthetic quilt over the top.
- Buying used means waiting, sometimes a couple of months, for a reasonable price.
- No lab rating behind the 20, like everything from this maker.
Questions owners ask
Is it actually roomier than the UltraLite?
Do drafts get in when you roll over?
Is buying used sensible?
Western Mountaineering AlpinLite 20, head to head
Others in the same band
More from Western Mountaineering →
Western Mountaineering
Western Mountaineering UltraLite 20
Western Mountaineering has been building bags in San Jose for fifty years and has never published an EN or ISO rating for any of them — the 20 °F on the UltraLite is the company's own number, and its reputation rests on that number having been accurate for two generations of backpackers. What it does publish is the physics: 5.5 inches of measured loft, 16 ounces of 850-fill goose down, 59 inches of shoulder girth and a 12-denier shell, for a total of 29 ounces. Continuous horizontal baffles let you shake the down to the top on a cold night or to the sides on a warm one, which is a feature almost nobody else offers and which more than compensates for the missing zip vent.
Best for: Buyers who plan to own one bag for twenty years
Full spec sheet
Western Mountaineering
Western Mountaineering VersaLite 10
Ten degrees, six and a half inches of loft, twenty ounces of 850-fill down, and three inches more shoulder girth than the UltraLite — which is the point of it. The VersaLite is the bag for someone whose trips run from October frost to alpine summer and who would rather carry three extra ounces than own two bags. At 32 ounces it weighs less than plenty of 20-degree bags in this catalogue, and the girth means a puffy jacket can be worn inside it without crushing the loft.
Best for: One bag covering shoulder season and light winter
Full spec sheet
Feathered Friends
Feathered Friends Hummingbird UL 20
Twenty-three point nine ounces for a hooded, full-zip 20-degree bag with 950-fill down — the lightest bag of its kind in this catalogue by about five ounces. Feathered Friends gets there with a 7-denier-by-30-denier Pertex Quantum Pro shell, which is a waterproof-breathable fabric rather than a simple ripstop, and by trimming the shoulder girth to 57 inches. That last number is the thing to check before buying: this is a close-fitting bag, and a broad sleeper will compress the down against the shell and be cold in it.
Best for: Long trails where a hood is wanted but ounces decide
Full spec sheet