Hops were traditionally packed for transportation in very large woven sacks, known colloquially as 'hop pockets'. They were moved in their pockets on the railways in standard short wheelbase open wagons, but were always sheeted over with tarpaulin to protect them from the elements.
At he present time, the majority of the hops used by British brewers are imported, most of them coming from Belgium and are carried in bulk in closed vans with sliding roof sections for access. Open topped vehicles are no longer an option because of the speed and the aerodynamics encountered in the transit through the Channel tunnel. In the UK indigenous hops are now moved by road transport.