When I was trekking in Nepal in 1983 the sherpas brought soda in bottles up into the mountains in baskets. Carried on the back by a rope and pad over the heads. We had to get out of the way so they could pass as the jogged up the trails that we struggled to climb. And those Cokes (not the real stuff but the local brand) sure tasted good at the end of the day. For bulkier loads, they uses bigger baskets or a board to support the cargo.