Carry on is for items of value that passengers do not want to be apart from (in my case photographic equipment & laptop)
(a) People are so precious about their electronic equipment...
Q. how do you think it gets to you in the first place ?
A. packaged in cardboard, with a bit of foam, stuck in the hold as cargo !
(b) I've got two words for you if you insist.... "F-Stop Bags"
They are all size compliant... BUT ... if you find yourself on the receiving end of a gate dragon and don't fancy an argument .... ICU out and with you ... bag with cables & gubbins in the hold.... 10 seconds, dragon sleighed and you can change your equipment-baby's diapers in-flight ! Wonderful bags !
Oh and one last word for you .... " I N S U R A N C E"