Cadence Sensor spare straps nonsense

I just needed to buy new rubber strap for my cadence sensor, but I can't get what Garmin does mean with pack of 3 different sizes. What do I do with other 2 useless sizes? Just throw it to trashbin? What a waste. C'mon Garmin.

I would prefer pack of 3 (or just 2 would be enough) same sizes, so I can keep them as spare.