We only Travel with hand luggage so our 2nd bag is important. These bags are ideal as Ryanair size. They'll go under your seat & are ideal for books, Kindle's, snacks etc. Reviews are really good. It has a variety of straps, shoulder, hand & will also attach to wheely trolley.
I'll pack my small holiday handbag & fill this one.
Variety of colours.
https://www.amazon.co.uk/Lightweight-Ryanair-Holdall-Stowaway-35x20x20cm/dp/B01B81U9KU/ref=pd_lpo_198_tr_t_3?_encoding=UTF8&refRID=9PFDYQRMVM51KN4H1M7B&th=1