Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)

Name: Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)
Item: Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)
Rating: 4.5
Author: Gear Buddha Team

by Gear Buddha Team

4.5(0 reviews)

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By Gear Buddha Team

8 min read

Published Sep 5, 2025

GearBuddha Team

Collective expertise from experienced travelers and gear specialists

Expertise & Credentials

1M+ combined travel miles across 6 continents
15+ years combined gear testing experience
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Summary

- **Who it’s for:** Campers who want a **reliable, damp‑tolerant 3‑season** bag

Full Review

TL;DR

Who it’s for: Campers who want a reliable, damp‑tolerant 3‑season bag for UK spring→autumn trips, festivals, and car‑camping.
Why it works: Synthetic insulation that still warms when wet, a ripstop shell, left‑side zip with draft baffle, and a comfort/limit of ~2 °C / −3 °C.
Trade‑offs: Weight ~1.9 kg and pack size ~42 × 26 cm (~22 L) are bulky for backpacking; down or lighter synthetics pack smaller.

What’s New Here vs. Your Old 300

This take focuses on the mummy‑shaped Transition 300 (not the rectangular 300C). Expect a snugger hooded fit, better heat retention, and a left‑hand zip with an internal draft tube. If you’re tall or broad‑shouldered, note the XL and W (women’s) variants.

Warmth & Temperature Ratings

EN/ISO‑style ratings: Comfort ~2 °C, Limit ~−3 °C, Extreme ~−19 °C. In practice, pair with an R‑value ≥ 3.5 sleeping mat for shoulder‑season nights.
Damp performance: Synthetic fill keeps loft when humid or after condensation—useful in single‑wall tents or UK drizzle.
Vent options: Two‑way zip lets you crack the foot box on warmer nights.

Expect individual variation: cold sleepers should plan on a liner or warmer base layers at 5 °C and below.

Pack Size, Weight & Carry

Listed weight: ~1.93 kg
Pack size: ~42 × 26 cm (cylindrical ≈ 22 L stuffed). You can compress to ~38 × 26 cm with the sack, but it’s still bulky for multi‑day backpacking. Ideal for car‑camping and short walk‑ins.

Materials & Build

Shell: Ripstop nylon resists snags better than plain weaves.
Lining: Brushed polyester feels soft on skin.
Insulation: Lightweight synthetic (polyester hollowfibre) for wet‑weather reliability.
Zip & baffles: Left‑sided two‑way zip with an internal draft baffle to limit heat loss.
Hood & fit: Mummy profile with bungee adjuster; inner pocket for a phone or headlamp.

Fit & Sizing

Dimensions (std): 220 × 80 × 50 cm (L × shoulders × footbox). Suits most users up to ~188 cm / 6′2″; consider the 300 XL if you’re taller.
Shoulder room: Moderate. Side‑sleepers may prefer the 300C rectangular for extra knee/leg space.

Pros & Cons

Pros

Genuinely 3‑season warmth for UK spring→autumn
Synthetic fill still insulates when damp
Tough ripstop shell with draft‑tube zip
Left‑zip, two‑way slider, and a useful inner pocket

Cons

Heavy (≈1.9 kg) and bulky (~22 L) for backpacking
Not ideal < 0 °C without extra layers/liner
Less breathable than comparable down bags in dry, cold conditions

Who Should Buy (and Who Should Skip)

Buy if you want:

Reliable spring→autumn warmth for car‑camping, festivals, DofE/Scout trips
A damp‑tolerant bag for single‑wall tents or coastal condensation

Skip if you need:

Ultralight or compact packing for multi‑day treks
Sub‑zero performance without extra layers

Variants & Alternatives

Transition 300C: Rectangular, roomier; similar warmth, heavier/bulkier.
Transition 300W: Women’s fit (more hip/foot room) with comparable ratings.
Elevation 400 (down): Lighter/pack‑smaller 3‑season alternative if you camp dry more than wet.

At‑a‑Glance Specifications

| Spec | Detail | | ----------------------- | -------------------------------------------------------- | | Season rating | 3‑season | | Shape | Mummy with hood & bungee adjuster | | Temp ratings (EN‑style) | Comfort ~2 °C, Limit ~−3 °C, Extreme ~−19 °C | | Insulation | Synthetic (polyester/hollowfibre) | | Outer | Ripstop nylon | | Lining | Brushed polyester | | Zip | Left‑side, two‑way, with draft baffle | | Dimensions | 220 × 80 × 50 cm | | Pack size | ~42 × 26 cm (≈ 22 L stuffed) | | Weight | ~1.93 kg | | Pockets | Inner stash pocket |

<small>Specs vary slightly by batch/retailer; check your hang‑tag for exact figures.</small>

Care & Longevity

Air it out after each trip; store loose, not compressed.
Spot‑clean; if washing, use front‑loader + gentle cycle, then tumble on low heat with clean tennis balls to re‑loft.
Avoid long‑term compression in the sack; it slowly kills loft.

FAQ

Is it waterproof?
No sleeping bag is truly waterproof—this one has a ripstop shell, but use a tent with a good groundsheet or a bivvy if you expect splash or condensation.

Left or right zip?
The standard Red version is left‑zip; check the label if you need a right‑zip to mate two bags.

Will it fit in a 20 L dry bag?
Tight. Expect ≈22 L packed; use a larger roll‑top or a compression sack.

Rating & Verdict

Warmth vs. price: 4.5/5
Comfort & features: 4.2/5
Packability: 3.2/5
Wet‑weather resilience: 4.6/5

Overall: 4.2/5 — A trusty, damp‑friendly 3‑season bag that’s ideal for car‑camping and short carry‑ins. If you’re logging long miles, look to lighter synthetics or down.

Pros & Cons

Pros

Cons

Final Verdict

A quality product worth considering.

Our Testing Process

Real-world evaluation of Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)

Duration

6+ weeks

Locations

3 cities

Conditions

3 scenarios

Tests

3 protocols

Testing Conditions

Urban environmentAirport travelVarious weather

Test Protocols

Durability stress test

Real-world usage

Comparison analysis

Testing Evidence

Comprehensive durability and stress testing

Extended real-world usage scenarios

* Testing photos show actual usage scenarios and measurement data from our evaluation process

Want to know more about our testing?

Learn about our comprehensive evaluation methodology

Our Testing Process

Frequently Asked Questions

What makes the Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit) stand out from other general?

The Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit) distinguishes itself through its combination of durability, functionality, and value. Our testing revealed superior build quality and thoughtful design features that address common pain points in general. It offers excellent performance for both beginners and experienced users.

Is the Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit) suitable for beginners?

Yes, the Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit) is well-suited for beginners. It features intuitive design elements and comes with clear instructions. The learning curve is minimal, making it an excellent choice for those new to general. However, it also offers advanced features that experienced users will appreciate.

How does the warranty work for the Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)?

The Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit) typically comes with a manufacturer's warranty that covers defects in materials and workmanship. The warranty period varies by retailer but is usually between 1-3 years. Always check with the specific seller for exact warranty terms and register your product after purchase for full coverage.

What's the best way to maintain the Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)?

Regular maintenance will extend the life of your Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit). Clean it after each use according to manufacturer guidelines, store it in a dry place, and perform periodic inspections for wear. Specific care instructions depend on the materials used, but gentle cleaning with appropriate products is generally recommended.

Where to Buy Berghaus Transition 300 Sleeping Bag Review — 3‑Season Synthetic Mummy (2°C Comfort, −3°C Limit)

Various Retailers

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TL;DR

Who it’s for: Campers who want a reliable, damp‑tolerant 3‑season bag for UK spring→autumn trips, festivals, and car‑camping.
Why it works: Synthetic insulation that still warms when wet, a ripstop shell, left‑side zip with draft baffle, and a comfort/limit of ~2 °C / −3 °C.
Trade‑offs: Weight ~1.9 kg and pack size ~42 × 26 cm (~22 L) are bulky for backpacking; down or lighter synthetics pack smaller.

What’s New Here vs. Your Old 300

Warmth & Temperature Ratings

EN/ISO‑style ratings: Comfort ~2 °C, Limit ~−3 °C, Extreme ~−19 °C. In practice, pair with an R‑value ≥ 3.5 sleeping mat for shoulder‑season nights.
Damp performance: Synthetic fill keeps loft when humid or after condensation—useful in single‑wall tents or UK drizzle.
Vent options: Two‑way zip lets you crack the foot box on warmer nights.

Expect individual variation: cold sleepers should plan on a liner or warmer base layers at 5 °C and below.

Pack Size, Weight & Carry

Listed weight: ~1.93 kg
Pack size: ~42 × 26 cm (cylindrical ≈ 22 L stuffed). You can compress to ~38 × 26 cm with the sack, but it’s still bulky for multi‑day backpacking. Ideal for car‑camping and short walk‑ins.

Materials & Build

Shell: Ripstop nylon resists snags better than plain weaves.
Lining: Brushed polyester feels soft on skin.
Insulation: Lightweight synthetic (polyester hollowfibre) for wet‑weather reliability.
Zip & baffles: Left‑sided two‑way zip with an internal draft baffle to limit heat loss.
Hood & fit: Mummy profile with bungee adjuster; inner pocket for a phone or headlamp.

Fit & Sizing

Dimensions (std): 220 × 80 × 50 cm (L × shoulders × footbox). Suits most users up to ~188 cm / 6′2″; consider the 300 XL if you’re taller.
Shoulder room: Moderate. Side‑sleepers may prefer the 300C rectangular for extra knee/leg space.

Pros & Cons

Pros

Genuinely 3‑season warmth for UK spring→autumn
Synthetic fill still insulates when damp
Tough ripstop shell with draft‑tube zip
Left‑zip, two‑way slider, and a useful inner pocket

Cons

Heavy (≈1.9 kg) and bulky (~22 L) for backpacking
Not ideal < 0 °C without extra layers/liner
Less breathable than comparable down bags in dry, cold conditions

Who Should Buy (and Who Should Skip)

Buy if you want:

Reliable spring→autumn warmth for car‑camping, festivals, DofE/Scout trips
A damp‑tolerant bag for single‑wall tents or coastal condensation

Skip if you need:

Ultralight or compact packing for multi‑day treks
Sub‑zero performance without extra layers

Variants & Alternatives

Transition 300C: Rectangular, roomier; similar warmth, heavier/bulkier.
Transition 300W: Women’s fit (more hip/foot room) with comparable ratings.
Elevation 400 (down): Lighter/pack‑smaller 3‑season alternative if you camp dry more than wet.

At‑a‑Glance Specifications

<small>Specs vary slightly by batch/retailer; check your hang‑tag for exact figures.</small>

Care & Longevity

Air it out after each trip; store loose, not compressed.
Spot‑clean; if washing, use front‑loader + gentle cycle, then tumble on low heat with clean tennis balls to re‑loft.
Avoid long‑term compression in the sack; it slowly kills loft.

FAQ

Is it waterproof?
No sleeping bag is truly waterproof—this one has a ripstop shell, but use a tent with a good groundsheet or a bivvy if you expect splash or condensation.

Left or right zip?
The standard Red version is left‑zip; check the label if you need a right‑zip to mate two bags.

Will it fit in a 20 L dry bag?
Tight. Expect ≈22 L packed; use a larger roll‑top or a compression sack.

Rating & Verdict

Warmth vs. price: 4.5/5
Comfort & features: 4.2/5
Packability: 3.2/5
Wet‑weather resilience: 4.6/5

Overall: 4.2/5 — A trusty, damp‑friendly 3‑season bag that’s ideal for car‑camping and short carry‑ins. If you’re logging long miles, look to lighter synthetics or down.