Most people buy repellent the week before they fly, use half of it, and forget about it until the next trip. But you get bitten at home too, the garden after work, walking the dog, sat out on a warm evening. UK midges are relentless, and the bites are no kinder for being British.
Each pack holds 12 bracelets, they all sit together in one resealable pack rather than individually wrapped, less packaging, and our own testing shows they hold strength better that way. Better still, the clock only runs while a bracelet is out of the packet. Wear one for a weekend away, seal it back up, and the days it hasn't used are still there waiting - fresh for up to two years.
Which is why most people end up with one pack in the drawer and one in the suitcase. Covered at home, covered abroad whenever you go.