Prices: British Pounds
It is vital that hops are stored and packed in the correct fashion, hops are purchased in large bales that are then broken down into 100g packets. This needs to be done quickly as dried hops soon oxidise and they lose their aroma and flavour.
I have my own commercial grade vac packing machine which allows very rapid packing, hence the hops are exposed to the air for a minimal time.
Silver foil vac bags are used so the packed hops are not exposed to the light. All hops are sold labelled with their harvest date and alpha acid %, this is the component that gives the bittering quality to the hop, the higher it is the greater the bitterness of the hops.