Pencil Holder

My design is a flexible and comfortable storage container for utensils such as pens and pencils. This design allows for various different sizes to fit into it because the shell of the product will be made up of a silicon rubber so it'll slide into any spot you put it into. It also makes packing up and transportation easier.
No issues arose when creating this design.
If I were to redesign, I would add a couple of simple features to increase its versatility and change its height.
3D printing would help me understand what i would need to fix to make the design stronger.