Yeah I have an OCD with collecting things and nappies are on my list.
I have 6 boxes with packets and a set of draws with half packets in my roof of nappies I love, want to wear but don't want to never be able to get again.
Since I wore Tena Slip Maxi for 15+ years I did used to keep one or two from the last packet just before they would change their look and/or quality but since I was done with those went through them and sold the remainder of the very best ones on eBay...
Hard for me to let go and I did see I somehow even have a part pack left over European made Tena Slip Maxi stashed.
I keep one of every kind of diaper I've tried, just so I have something to compare to if the brand ever changes. Unfortunately now that collection is taking up the entirety of my hiding spot, so I may have to start using it to make space.
I had a collection of around 36 brands, one of each sealed in magazine collecting cellophane sleeves. They were locked away in a trunk in my closet until I had to move out. Sadly I had to go through a whirlwind of wearing and using all of them up, but at least I wasn't forced to throw them out. Some of the diapers are now discontinued and selling on ebay. Great Memories though.