Just on the sentimental side of things... you don't need to keep the item. Take a photo instead. I've been doing this as I have a rather small house & just don't have the room for any excess. Toys and artwork. Take a photo, toss it out or donate. You can still take a trip down memory lane but you save yourself a heap of boxes to store and move from house to house.

And please do me a favour. If you want to keep any "for the grandkids", keep it for yourself for use at your own home rather than for giving to your children and cluttering up theirs. They won't appreciate it and their partners will probably resent it. In my experience as a DIL!

Great job OP!

ETA: I have one box of items for each kid that I have kept that are special to me. They are "for the kids" but I don't kid myself that they are really for me. I put things in there that I want to keep for me. Like mother's day cards and artwork, their fancy birth certificate, baby handprints and footprints. I expect it will be nice to go through with them when they are older but I have no intention of ever giving it to them to keep unless they specifically want it.