I make them and then dismantle them, but I do keep a box full of things at the ready that help me make them like coloured rice and pasta and things I find here and there that I think may be good for a future sensory bin. I try to salvage what I can from the bins for future bins after we use them. I will try to do a post later this week or early next week about why we do sensory bins and a few tricks (like how to colour the rice and pasta). Adopted children are much more likely to have Sensory Processing Disorder (for a huge list of reasons that I will list in the post that is only in my head right now!) and so sensory bins are great for that. Other kids seem to like them too though.