The GMS pill organizer has a gasket seal, this strong closure makes it moisture-proof and airtight. This design secures your medication from oxidation concerns. This pill dispenser will help you maintain your daily dosage and help organize your pills, vitamins and supplements. Fits multiple size pills in each container with a strong latch on each individual compartment to prevent spills but easy enough for the elderly to open. Made BPA-free and with high quality this plastic built to last.