I have a pair of Mountainsmith Lumbar packs, both either over or pushing 30 years old (I have two because I misplaced and replaced my first, but later found it).

It's an excellent pack, cinches up tight, mount it front or back, strap it to something else, you can pack the straps and use it as a simple satchel, or use the shoulder strap.

Very high quality materials and zippers.

It's for I'd consider "urban travel", great as a carry-on. Paperback books, tickets, meds, passports, journal, snacks. They've been in "the wild" but I don't drag them on rocks or things like that.

They're over $100 today, so not cheap, but at a glance on the website, they look pretty much identical to what I have (and I know my second has slight differences in design from my first).

Were I in the market, I wouldn't hesitate to drag and drop one into a cart and get another. I've not used their larger packs, and over time they've expanded their lumbar line. But I would completely expect their other products to be similar quality as the ones that I have.