Scenario: 2-day gorge walk
What to bring:
1. Light inflatable mat
2. Thermal bivy
3. Fleece
4. Thermal clothing for the night sleep
5. Food for 2 days
The rest is small stuff that can be kept in pockets: phone, headlamp, etc.
It would be silly taking a 40L pack when all that stuff can be squeezed in a 20L one.
What would be the tightest size you'd recommend?
Cheers!