In our house, we generally go for variety in our coffee beans. That means when we are finishing one bag, we’re going to open a different bag with totally different beans inside.
What do you do if there aren’t enough old beans to make a full serving of coffee?
It may be heresey, but I mix the final old beans with a few beans from the new bag and call it my “bonus blend”.
I usually have a few bags on the go as well, variety is nice. Once there’s not enough left for a cup I’ll wait until another bag is in a similar state and combine. Sure it’s not as fresh and sometimes it’ll be a weird blend, but usually super good enough.