This is a great little microcache container with a spot to mount 1/4" round neodymium magnets. Log sheets can be found here. The 1 inch or half inch seem to work okay in this container. http://www.techblazer.com/geocaching-log-sheets/ Print the lid and body at 100% infill for strength. Use plyers to press fit 1/4" round magnet into the lid. The container may be hard to open at first. Will require a few open and close cycles to free up. Paint with your favorite spray paint to camouflage. NOTE: Paint with lid ON so you don't affect the fit.