Top Rated: Alpkit Cloud Cover (8.5 / 10)
Category: Modular Sleeping Bag 1: Best ~450g 1 Season and Inner
Scramble's Recommended Sleeping Bag System
The military modular system uses 2 bags: a lighter "patrol" bag (down to 0°C) and a medium-weight cold weather bag (down to -15°C) which combine for extreme cold (down to -30°C, but a total weight of nearly 3kg).
Scramble's recommended "modular" system uses 3 bags, is lighter and a little more flexible (better in hotter, arid conditions, yet still good down to around -25°C, the extreme combination weighing just over 2kg). This summary is for the ultralight summer bag (and cold weather inner): Sleeping Bag 1.
Review Summary
The Cloud Cover is something of a down floozy that mates well with synthetics: in particular Nordisk's Abel +10 and Carinthia's Defence 4. Synthetic insulation guarantees warmth when wet and down is still the winner when it comes to getting the most warmth for your gram. Pairing the two makes an ideal and highly flexible sleeping system. For this reason Alpkit's Cloud Cover is our top choice for Ultralight 1 Season / Inner Bag.
Now all Alpkit need to do is keep a check on inflation and future sterling devaluations. I love how Carney at the Bank of England talks about his 2% inflation target, when back in the real world, UK manufacturers like Alpkit have to deal with rising input costs which sees price rises of 50% since 2015!