Sachets
Single-use. Tear-corner. The ketchup-packet format, honestly.
For the glovebox, the gym bag, the visitor bathroom, the pew. Nobody forms an
attachment to a sachet and nobody should. It is there, you use it, it is
over. We spent a long time arguing that this was beneath us. It was not
beneath us. It was simply cheap, and we had confused the two.
Dispensations
Refillable cartridge. Fitted dispenser. Made to a household.
The cartridge is the consumable. The Dispensation is the thing it seats
into, and the Dispensation is yours: sized, finished and marked for the house
it lives in. This is where the loyalty actually lives. Offer a customer an
identical replacement packet and they will take it without blinking. Offer to
swap out their Dispensation and you will find out very quickly that it is not
interchangeable.