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Far and away the COR Surf Travel Backpack.
Got it on Amazon for $94.
Great warranty too and super tough to boot.
My husband and I each have the 28L.
Because we’re not fully retired we have to take work with us. I can fit my laptop, 2nd sidetrack screen, iPad, toiletries, and clothes for a week in it.
Straps tuck to carry like a suitcase if needed and it opens just like a suitcase.
Also has two ‘secret’ security pockets, great for passports and cash.
I’ve tried many and will never try another.