All those boxes of snacks, crackers, and cereals never fit perfect because they are all different shapes and sizes. The first thing you will want to buy is large mason jars. There are so many sizes to choose from so see what works for your space. You will also need to decide how many will fit in your pantry. You will need a dry erase marker and of course some yummy snack.
I have 60 jars that are 64oz in my pantry. It may seem like a lot but when you buy a big flour or big sugar those each take 3 jars each, so they fill up fast. You can always start with a few and add more jars as needed. This will keep the cost down when you start transitioning your pantry.