20 year old cyclist son uses his bike (bicycle, not motorbike) to get to work. Takes his lunch and clothes etc in a rucksack on his back.
His current one is falling to bits so I'm thinking I'll buy him another one with fairy lights on to keep him safe. He's fine with me buying it, but is insisting on it being black, rather than the fluorescent green or orange I'd choose for him. I appreciate they're not cool, but I like him and want him to stay alive 
Even the black rucksacks meant for cylists don't have much in the way of luminous stuff on. AIBU to think there must be a black (or similar coloured) cyclists rucksack that will show up in the dark?