Are your shelves fixed because you are doing the roll out shelves like in your photo? If so, I would look at your existing shelving and examine what you would group the same or differently. I gave my cabinet maker the tallest items on each shelf in my pantry and said, "I need this shelf to fit this item." The number one thing I had going on was that I could only fit the olive oil bottle from Costco on one shelf. I would have preferred to have it with other items, but was limited my the height.