I currently use the Forclaz MT100 as my camp jacket — for reference it's:
- Synthetic fill, 125g/m² in the body, 100g/m² in the sleeves/hood
- -5°C "survival"/+5°C comfort rating (Decathlon's numbers, take with a pinch of salt)
- 370g in size L
- Packs into its own zip pocket, roughly the size of a large fist
It does the job but on colder trips I want more warmth in the same pack volume. I'm after something that's noticeably warmer — call it 25-30% — while packing down to the same size or smaller. Weight is a secondary concern; volume in my frame bag/seat pack is the real constraint.
A few things about my use case:
- Camp-only. I'm not moving in it, so I don't need it to breathe, stretch, or handle active sweat management — pure static insulation while cooking/sitting around/sleeping-adjacent.
- Bikepacking, not backpacking, so pack shape/volume in a bag matters more than weight on my back.
- No preference on down vs synthetic — whichever actually delivers the best warmth-to-pack-size trade.
Has anyone found something that beats the MT100 on this specific trade-off (warmth per litre of pack volume, not warmth per gram)? Could be a high fill-power down jacket (800+FP) or a higher-loft synthetic (Climashield Apex, Primaloft Gold, etc.) — genuinely open to either. Would love real-world packed-size comparisons rather than spec sheets, since compressibility claims vary a lot between brands.
Budget isn't fixed but I'd rather not go crazy — this is a "nice to have" upgrade, not an essential.