SOC: Organizing Keepsakes

Besides their photo album the kids also have a notebook documenting their various milestones. I’m been wondering if there are any other items I should keep on their behalf which would not clutter up the place. We are staying in an apartment and space is limited. Every little keepsake that I collect will have to be multiplied by three so that it’s fair for each kid to have the same momentos.
How do you organize keepsakes for your kids?

