The bolts are graded in diameter for a more difficult exercise. Five slotted bolts and stubby screwdriver. Designed by a Montessori teacher to aid the development of eye-hand coordination and teach a practical skill.
Attach small pieces of Hook Velcro to the bottle. Attach small pieces of Loop Velcro to small toys. The bottle& screw cap makes for nice storage. The child must stabilize the bottle while removing the toys to insert inside.
Learning basic sewing with a polystyrene plate, yarn, + plastic needle. I remember doing this with craft mesh when I was a kid and then graduating to sewing buttons by hand onto little pillows and pockets.