1/4 LB Pouch with one-way degassing valve and a ziplock seal. You load it from the top, and then you close the ziplock, and you're good to go. You can optionally heatseal it above that. It stands up neatly. The color of this bag is black. The back of the bag is clear see-through plastic so that you can see the coffee beans.
That way, this bag also works nicely for packaging tea.