Repacking a 30L backpack into a 20L Ryanair bag for 1 week in Türkiye!

With clever packing, can you fit everything for 1 week in Turkiye into a free 20L Ryanair bag?
I'm flying with Jet2, so have a very generous luggage allowance (checked bag, plus cabin luggage and a personal item). However, as a hand luggage only traveller, I am only using the carry on items, a 30L backpack, plus a Uniqlo bag as my personal item.
But if I was to book a cheaper flight with Ryanair, which only includes ONE free underseat bag, could I pack for 1 week in a Ryanair bag?
In this video I repack my luggage for my next trip to see if I can actually fit EVERYTHING into a smaller bag, if I packed things a bit smarter?

Bags I always use:
Cabin Max Metz 30L
https://betweenenglandandiowa.com/202...

The Travel Hack Backpack by Cabin Max (20L Ryanair bag)
https://betweenenglandandiowa.com/202...