Designed to pop open easily with a push of the thumbs, the Bubble-Lok design also ensures you pills are stored securely when it is closed. This 7-Day Ultra Bubble-Lok® XL Pill Organizer features a unique patent-pending locking system that simplifies operation and prevents pills from spilling inside your briefcase, purse, or suitcase. Contoured compartments mean easy pill removal. To open any compartment, use yourEas thumb to simply push on the contoured Ultra Bubble-Lok wall area on the front of the compartment and the lid will pop open.