B.B.
The cups are pretty easy to stack together.
The lids can be tricky. I stack if I can, but sometimes that doesn't work as well as I'd like.
I typically get wipes by the case from Sam's or from Target, so I have a few extra empty dispenser boxes. I took the tops off of a few, ran them through the dishwasher to clean, and then use them to store the lids in. I also have one that I for "bottle supplies" (nipples, rings, etc.), another one for "medicine droppers", another one for nuks. (Some of them I do use the lids for - helps in stacking them up - then just write with a marker what's in each one.)