Tired of rolling suitcases for day trips in Australia: Anyone have a great 2 day travel backpack they like?

My favorite bag for travel is the Patagonia Black Hole MLC 45. Great for short trips. Perfect carry-on size and you won’t get strange looks when walking into nicer establishments.

https://www.patagonia.com/product/black-hole-mlc-convertible-suitcase-45-liters/49307.html?dwvar_49307_color=SEQR&cgid=luggage-black-hole-bags