Having more stuff than you think you have

Packing up your house and putting it into one area, the moving truck, made us realize just how much stuff we really have (and we took away 2-3 trailers full of stuff). We have removed more stuff than most people do when they move, but still feel like we have further to go. No closets in the new house makes our stuff more apparent...there is nowhere to hide it! Our goal is to reduce the amount of stuff by 25% for our next move. The biggest offenders seem to be clothing, shoes and toys. We are also trying to deal with all the folders/paperwork and accumulated sentimental keepsakes/photos.