Always missing when you need one, or the wrong size? Worse is when they stop working or break and you’re left unable to charge your device. Then buying a replacement is a toss-up between forking out for the genuine, expensive product (which often breaks down just as fast) or buying another brand and hoping it works.
Two suggestions: look into a high-quality, resilient charging cable before it’s urgent and try removing dust/fluff from the charging port before despairing.