Waterproof Laptop Backpack

Hi, I’ve just got a new laptop and after frying numerous things over the years due to rain (I live in Ireland) i’m looking for a waterproof well padded laptop backpack (i cycle to work so a backpack is best) that will take a 17″ laptop. however i cant find any that are both padded well and waterproof. Can you make any suggestions?

thanks

Brendan