Ball RealFruit 5.4 Oz. Classic Fruit Pectin (2 pack)

This was a better deal than buying a single container and I make jams and jellies yearly, including mulberry jam. For my recipe, it calls for a specific amount of pectin, so it isn't a recipe that just says "1 box of pectin". I find that buying the containers of pectin, you have the flexibility to tweak batches -- like if you wanted to do a different sized batch. Ball is a brand I trust, so I can rely on the quality of the pectin to do its job and not fail my jam or jelly batch. For those new to canning jams and jellies: just make sure you follow the guidance on different fruits as far as adding lemon juice and sugar measurements; a certain level of acidity is needed to for the jam or jelly to set. Apple jelly doesn't require any pectin, for example, because it is a fruit that already contains pectin in its flesh and peel. But many fruits need pectin, and pectin needs acid and sugar to give you a nice firm jelly or jam.