A great way to repurpose an inhaler canister into an airtight pillbox. Use a standard plumbers pipe cutter to remove the top portion & then do the same thing to the bottom
Tubee "Portable spacer inhaler for asthma patients" on Behance
Cleaning and maintaining your inhaler | Asthma + Lung UK
Use of Medication - How to use Metered Dose Inhaler (MDI)