Ryanair recently changed the luggage rules allowing a second small bag:
One cabin bag weighing up to 10 kg with maximum dimensions of 55cm x 40cm x 20cm, plus 1 small bag up to 35 x 20 x 20 cms may be carried per passenger
I have a 15.6" laptop, which works out to 38cm width, or about 42 cm with a thin case. Would Ryanair tolerate the laptop exceeding the maximum width? The luggage sizers at the airport are open-ended, so theoretically one could fit the laptop case with the long side sticking on top.