EasyJet - which I tend to use - has:
"Everyone can bring one small cabin bag per person on board for free.
It can be a maximum size of 45 x 36 x 20 cm (including any handles and wheels) and needs must be kept under the seat in front of you. That should be enough to bring all the essentials for your journey or for a short trip. Your bag can weigh up to 15kg, but we do ask that you’re able to lift and carry it yourself". If you pay extra for speedy boarding etc, they allow a second bag (I have posted a picture of how I can get an R7, R5, RF100-500, RF100-400 + iPad into the second).15kg is a lot and they never weigh.
Ryanair, the Canon of cheap airlines, has a limit of 10kg and I have seen them check at the gate - that way you have no chance of avoiding extra payments. Avoid them if you can.
BA never checks weight.
I used Ryanair a million times with a fully loaded carry-on backpack and not a single time was asked to weigh it. Maybe i was just lucky.
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