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A pencil case with multiple compartments of different size will help you effectively pack your supplies. Try to get a case with stackable layers, in order to fit in as many supplies as needed. Organize each compartment with supplies of the same category and/or size. Put the compass, protractor, and calculator together. Carrying a pencil case between classes as well as back and forth from home will definitely cause some wear and tear on the fabric. Choose a fabric that will be less likely to rip in between classes, so none of your supplies fall into your backpack or on the floor. Try to get a pencil case made with nylon fabric. Not only is it easier to clean, it is strong enough to stay intact if you fill your pencil case to maximum capacity. Hard plastic pencil cases are durable, but make sure to keep track of how much supplies you try to pack. If you pack too much, you will be less likely to close the case because it has a lid instead of a zipper. A medium sized pencil case would be the best size for everyday classes. You may have a class where you may need more room for a ruler or a notepad, so a larger case would be suitable. If after a few months of your school routine, you notice that you are not utilizing many of your supplies, scale down to a smaller pencil case. This will fit in any backpack, and could even be left out on your desk since it wouldn't take up much space. Some people find it best to only carry the necessities and keep a bigger pencil case in their locker for things that are specific to one class (geometry kit, watercolours, coloured pencils etc.)
Get a case with compartments. Pick one with a durable fabric. Decide on the size.