Unscrewing and screwing caps and covers onto containers not only teaches a functional skill, but develops eye-hand coordination.
It is generally easier for young children and older clients with developmental delays to first learn how to open (unscrew) and later learn how to close (screw cap on).
I cut a variety of container or bottle tops from detergent bottles, vitamin jars, dishwasher soap bottles, juice bottles etc. Some clients enjoy matching the covers to the corresponding threaded pieces. You may choose to start out using all the same size covers/caps and threaded pieces to make the task easier and then build in challenge by requiring matching.
In the first video, a young man who is blind and has autism unscrews the pieces and then inserts the cover into the container hole and then stacks the threaded piece onto the dowel. He enjoys using his advanced matching and sorting skills.
Source: Unscrewing Bottle Caps to Insert or Stack by RecyclingOT on Rumble
After removing the covers, my client inserts them into the corresponding holes in the container. This former kitty litter bucket functions as a shape sorter after he separates the two pieces.
Source: Matching Lids Sensory Activity by RecyclingOT on Rumble
This man enjoys pulling on the threaded bottle tops that are attached to the book stand with elastic cord. He regularly seeks out sensory stimulation by pulling on objects, including his clothing. He also enjoys using force to unscrew the covers before inserting into them a bucket.
Source: Container Lids Sensory Activity by RecyclingOT on Rumble