Best overallWhat the porter actually carries
Mountain Hardwear Camp 4 Duffel 65 L
Weatherproof, takes a bus roof in rain without complaint, and 65 litres is the size that keeps you inside a porter weight limit. Take this rather than the 95 L version: the big one is a trap, because you will fill it.
Skip it ifAnyone tempted by a 95 L duffel. Our porter limit is 15 kg for two trekkers combined — a bag you cannot fill is a feature, not a compromise.

