Tripp luggage

Thanks darconio. Good deals there. Will be interesting to see if there are any VAT related charges under the €130 limit.

I know it's long enough since you asked that question but best quality price is the Decathlon 20l Kipsta por 8€. We got a couple of them and they are the perfect bag for Ryanair basic fare

https://www.decathlon.ie/p/324098-139648-20l-bag-essential-blue.html

Yes it does. As you can see in the item description the measurements are 40 x 23 x 20 cm. We use it several times with Ryanair and I can confirm that it fits in the airport personal luggage cage. There are plenty of videos online showing it too just google decathlon bag ryanair

The quality on these bags is amazing. The only con is that they need to be carried by hand rather than a backpack but they are top notch for Ryanair

Ryanair and Aerlingus have different minimum bag sizes, that said the aerlingus one on paper is tiny, I have not seen them enforcing it