Once you’ve decide which of your children’s papers you are going to save, you need a storage solution. Some people keep a small bin under the bed or in the hall closet and slip in papers during the year. That’s fine, just be sure to look through it once or twice a year and see if you can purge a few things. For a longer term solution, you can use a bin or file box. Have a hanging folder for each year of school and keep your paper gems there. Add in a box for 3D mementos and you have a great system.