Fold over bags are NOT air tight!
I do not know why, but coffee tastes better coming from a heat sealed valve bag - EVEN IF IT IS ONLY 3 DAYS out of roast (over fold sealed bags).
At Len's Espresso Blends, we only offer heat sealed valve bags and always bag, seal and ship the day of roasting...in fact the beans have always still been warm from roasting when they werre bagged.
Len



