The « consigne » counter at the bus station
Essaouira's bus station, on Avenue du Deuxième-Mars, has an office explicitly marked « consigne ». It is the only clearly identified bag-minding service in town, at around 5 MAD per bag, and travellers describe it as continuously accessible. It is about a ten-minute walk from the medina ramparts, which makes it a workable base for a day in town.
What it doesn't cover
It is a bus-station counter: no booking, no insurance, no itemised receipt. The round-the-clock access is traveller-reported rather than guaranteed — check the collection cut-off when you drop your bags, particularly if you plan to leave late.

