I love bin day although our landfill tends to be carrier bag sized as Richmond council recycle the majority of our waste.
My boys are really good at going through the weeks amass of art etc and deciding what will be going on the magnetic whiteboard in their rooms and what is going to the recycling.
You cant keep everything your child creates. I tend to add only a couple of things per year to our family scrapbook. Taking photos of things is another way of retaining the memory without the actual item shedding glitter, pasta shells etc.