What toys do you have that you will save after your kids have outgrown them. My kids are 6 and 10. As the youngest outgrows toys we tend to give away the usable toys. We have two fully furnished fisher price loving family dollhouses that will be saved in time, all of our American Girl dolls plus all of the matchbox or hotwheels cars. We don't have many legos but if we did those would also be saved. While I won't save every book I will save some books as well.
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DS is now 16 and I never considered saving any of his toys. I guess I have no desire to store them. I did save a couple of his favorite books, but only because they really don't take up much space.