Two packs save you a few bucks and boxes stacked together fit neatly on a shelf. They break up easily. I stayed away from generic cartridges for two reasons. It's not really a gas station. The HP LaserJet toner cartridge isn't just fresh toner, it's essentially a new machine. The drum in the cartridge is new, while the regular cartridge contains a used drum that has just fresh (?) toner added to it. Anyone familiar with laser printers knows that other brands of laser printers need to replace the drums after using multiple toner cartridges. This is one of the reasons why HP cartridges are slightly more expensive, they contain a new toner drum. I've been using HP laser printers since the 80's and unless you print a lot of dark graphics you get a lot more pages for the money than you would with an inkjet printer. (In addition, documents are printed many times faster.)
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