carry on baggage

The airlines have tighten up on carryon, Some enforce it more aggressively than others. I have stood in more than one Lufthansa line and watch then force the checking of rolling carryon bags because they would not fit in the sizing box. You probably need to be prepared to check your bag if over any of the limits because it could be the day they are enforcing the limits..

Erin,
I haven't actually looked at the site for Aer Lingus. They should also post the measurements of your carry-on and not just the weight. It is helpful to know the size of the measuring box.

I travel with a 17" Samso. It's the smallest roller on the market which means it will fit into any box. Air Crew deadhead a lot on various Airlines throughout Europe so it would be impractical to have to always check measurements. I know I'm safe with my 17incher.

Something also to note is that Luggage that says "Airline Approved" is a marketing stunt/tool. Not all Airlines approve the same size demensions. That is one of the most common arguements made at Check-in! I even got burned on that in my early days of travel.

The European airlines are more restrictive about 'cabin baggage' as they call it than US carriers. Your rollaboard bag will probably fit the size restriction but the weight limitation is ridiculous. My Costco rolling bag weighs almost that much empty.

You can find some really light carry-on bags. Try Air Boss, or the RS bag currently on sale.

I just rechecked the website & the bag dimensions are workable, 22 x 18 x 10, and I took that bag in & out & around Italy 2 years ago, no problem.
But 13 lbs is not too much more than many bags empty.