Cartridges come in many shapes and sizes, depending on your printer etc. And different brands have different ways of managing their products across their range. In some cases the terms: Standard / XL / XXL are used to describe cartridges. While the physical appearance of the cartridge may look the same, the volume of ink or toner within it varies. So you need to think about what volume of pigment really does fit your usage, verses the cost of that purchase.
Typically we encourage the use of XXL products, particularly for ‘black’ pigment applications. That’s why BrandPost works hardest to minimize the cost of larger volume products, because they’ll deliver more value to customers in the long-run.