What backpacks do you gals and guys like or/and use?
I have an Osprey Skimmer 22L which is a bit older and might not be found online that easily. But, I love it as it gets the job done with flying colors.
Go for the Patagonia Black Hole Mini MLC or at least that's what I did. It's around $170 so not very cheap but it's comfortable and big enough so you can pack everything.
I would go for an eBags Pro Slim one. It's cheaper than Patagonia at $100 and it's well organized. It's not as big but for most people it's enough I think.
Why go for a brand name and pay an extra $100+? I don't get it. Just get a no-name one that is big enough to fit your stuff and you're good to go. I have one for 7+ years and it was $22 and it's still good. Don't let yourself be fooled into thinking you need to pay $150 or more for a backpack.