DS2 is 6yo and has recently been putting all sorts of items in his pockets and playing with them. We've discussed it with his teacher and are looking at trying a fidget toy in his pocket - hopefully it will distract him as well as keep him from filling his pockets with things.
We're looking at this...
www.sensorytoywarehouse.com/product/fidget-bag-mini/
Any other suggestions would be appreciated.