REI Co-op Trailmade 20
REI Co-op
- ~20°F bag
- Synthetic
Outdoor calculator
Sleeping-bag temperature-rating selector
Campers choosing an EN/ISO comfort class. The decision this page isolates is narrow on purpose: pick a comfort-temperature and insulation type from the expected night low. Capacity, season, and packed size are the published facts that survive a weekend trip.
This page produces an explainable category or size so options can be compared without a product ranking. The calculator does not rank REI Co-op, NEMO, and Sea to Summit. It produces an explainable class so REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long, and Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long can be compared as examples of that class.
The working method is: Plan about 10°F warmer than the forecast low and prefer synthetic when nights are wet. Planning notes are grounded in Osprey. This page does not quote a price or rank a brand.
How to use this calculator
Campers choosing an EN/ISO comfort class. Pick a comfort-temperature and insulation type from the expected night low. If you can answer expected night low °f, this page can produce a class you can shop against.
What this page will not do
- This page does not quote a price or rank a brand.
- Manufacturer specifications and local rules can change and must be verified.
- The result is a planning category, not a safety, medical, or install guarantee.
Enter the planning inputs
Choose a sleeping-bag class by recording expected night low °f. Use real measurements or counts, not a rounded marketing number.
Mark the constraints that change the class
Only check expect wet or humid nights when that constraint is actually present. Extra checks can jump the class.
Read the bag class
Select class and treat the headline as a class, not a product name. Matching examples below follow 20°f, 3-season, Synthetic, 30°f, and Down.
Compare official pages, then verify
Open the official page for each example in that class. Confirm current specifications, dimensions, and terms. Decision Lantern does not quote a live price or complete an install review.
Planning classes on this page
- 20°f
- Example: REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long
- 3-season
- Example: REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long, Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long
- Synthetic
- Example: REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long
- 30°f
- Example: Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long
- Down
- Example: Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long
Bag class
3-season, 30°F comfort class
Compare options with at least:
- Plan from the EN/ISO comfort number near 30°F
- Limit ratings are colder than most people sleep well
Example products for Sleeping-bag temperature-rating selector
Real products that fit this planning category. Specs come from the manufacturer’s product page. These are examples, not rankings. Product names that go to Amazon are associate links. Decision Lantern may earn a commission at no extra cost to you.
NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long
NEMO
- Similar class
- In-stock Amazon alternative
Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long
Sea to Summit
- Similar class
- In-stock Amazon alternative
Compare the official examples
The table below is a side-by-side of the official examples on this page. Columns are published facts—maker, planning class, and notes taken from the official page—not scores. REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long, and Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long are included so you can see how classes differ, then open the official page for the current specification.
| Example | Maker | Planning classes | Published notes | Official page |
|---|---|---|---|---|
| REI Co-op Trailmade 20 | REI Co-op | 20°f, 3-season, Synthetic | ~20°F bag; Synthetic | REI Co-op Trailmade 20 official page |
| NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long | NEMO | 20°f, 3-season, Synthetic | Similar class; In-stock Amazon alternative | NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long official page |
| Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long | Sea to Summit | 30°f, Down, 3-season | Similar class; In-stock Amazon alternative | Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long official page |
Which example fits which class
REI Co-op Trailmade 20
REI Co-op
REI Co-op Trailmade 20 from REI Co-op is an example in the 20°f, 3-season, and Synthetic class. Published notes on the official page include ~20°F bag and Synthetic. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.
NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long
NEMO
NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long from NEMO is an example in the 20°f, 3-season, and Synthetic class. Published notes on the official page include Similar class and In-stock Amazon alternative. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.
Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long
Sea to Summit
Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long from Sea to Summit is an example in the 30°f, Down, and 3-season class. Published notes on the official page include Similar class and In-stock Amazon alternative. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.
What to verify before you buy
- Confirm the current specification on the official product or plan page.
- Match the planning class to your measured inputs, not to a brand preference.
- This page does not quote a price or rank a brand.
- Manufacturer specifications and local rules can change and must be verified.
- Recheck this page after 2026-11-14 or sooner if a manufacturer changes a published rating.
How this estimate works
Plan about 10°F warmer than the forecast low and prefer synthetic when nights are wet.
Know the limits
- This page does not quote a price or rank a brand.
- Manufacturer specifications and local rules can change and must be verified.
- The result is a planning category, not a safety, medical, or install guarantee.
Frequently asked questions
How does the sleeping-bag temperature-rating selector work?
It converts expected night low °f into a planning class using a published rule. Plan about 10°F warmer than the forecast low and prefer synthetic when nights are wet. The headline is a class such as 20°f, 3-season, Synthetic, 30°f, and Down, not a vendor ranking.
Is REI Co-op Trailmade 20 better than NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long?
This page does not rank REI Co-op Trailmade 20, NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long, and Sea to Summit Ascent Down Sleeping Bag, 25-Degree, Long. REI Co-op Trailmade 20 and NEMO Equipment Tempo Synthetic Sleeping Bag-Men's 20°F/Long are listed because they are real products with official pages that map to different or overlapping classes. The useful question is which class matches your inputs.
Can I treat the result as a buying recommendation?
This page does not quote a price or rank a brand. Use the class to decide what to read next, then verify fit, terms, and installation requirements on the official page and with a qualified installer when the product needs one.
Do the product links earn Decision Lantern a commission?
Not on the current preview. Links go to official manufacturer or service pages. If compensated links are added later, the disclosure on this page will say so in plain language.
What should I verify after I get a class?
Confirm the current specification, dimensions or plan limits, and any program terms on the official page. Manufacturer specifications and local rules can change and must be verified. The next editorial review for this page is due 2026-11-14.
Why these 3 examples?
They are real outdoor options with an affiliate program on file and an official product page. REI Co-op, NEMO, and Sea to Summit appear because each one can represent at least one planning class on this page, not because Decision Lantern tested or endorsed them.
Sources
- Osprey pack sizing, Osprey. Retrieved .
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