I just installed my pack 5 compatible Canon CLI-8 & PGI_5 Superior Quality cartridges. Besides the fact that my printer Canon IP Prixma 4500 series, no longer works, I realize that the capacity of each cartridge reservoir 'Parner Office' is exactly half that of my previous cartridges! This is a trick as another but that is stated anywhere when buying. The capacity ink cartridges is not indicated. It is not honest. I would not recommend this purchase.