This is a guy from Namche Bazaar working as a porter returning on the loose and rocky trail from Everest Base Camp with a load to take to the (helicopter) landing strip close to Namche.
One gas bottle, if completely empty, is 14.9Kg. The blue drums could weigh anything. In total he stated the load weighed around 90Kg which is carried via a strap over the forehead. Just to watch his strained face as he put the load down, trying to keep it vertical, was painful.
This opportunity to make money comes around only so often so when it comes, however the load looks, you take it.