We have a large-ish kiddie pool with a slide. Our yard will be unusable for a long time (until lead paint is abated and it looks like it is just not happening). So I want to bring the pool in and use it for activities in the house. The kids love using the slide. I considered filling it with ball pit balls but we already have a ball pit that the kids love.
Any alternatives to ball pit balls that won't make a huge house mess...sand and water are out as is anything the kids can tear up because I have five kids here most days.