This is a vape pen dugout I made to hold one battery and two oil carts. If you want to disguise it, there is a USB cutout for a female usb port to be glued in. This will make it look like a battery pack. I didn't have one on hand so I used a usb port plug. The holes are for magnets, but the tolerance was tight enough to stick with friction fit alone.
I did 15% infill on the body but bumped it up to 30 for the lid. but it might not be needed.