Yes, this bag is expensive. I think it's probably *slightly* overpriced for what you get. That said, it's a well constructed bag, and the I've heard great things about Peak's customer service should you need it. I do wish the iPad pocket/sleeve fit a full size iPad better, and that the bottom corners of the bag had a little better shape or padding. After using for three international trips, they are minor gripes and not enough to return it.
This serves double duty for me - it's a camera bag when I need it to be, otherwise it's a nice sling for travel or biking. There's a handy slot in the front pocket that is perfect for a passport (probably wasn't intended as such, but it's perfect in size and location). It's the perfect size to fit under a airplane seat. I can fit my iPad mini with zero issues, but my iPad air doesn't quite fit. I have to jam it in there and it feels wrong - like if you've ever stuffed a laptop in a backpack that didn't quite fit? That sort of wrong.. If the pocket/bag was maybe a half inch deeper or wider or something.
The strap is reversible - which is nice for a sling...some don't do that - you can adjust it all sorts of ways and swap what shoulder you use. It "slings" around you really smoothly and easily. When you swing it from behind to your chest, it just sort of goes and lands exactly where you need it. Zipping it up and slinging it back is just as easy. JUST MAKE SURE TO ACTUALLY ZIP IT UP - a tiny velcro/magnet closure as a last ditch security measure might be a good idea. I almost flung it behind me twice without zipping it up. Totally my fault but it's easy to be in a hurry when fumbling with gear in a city environment.
I carried my 5Diii, 24-70L, and 35mmL - as well as 3-4 batteries, a charger, a couple filters, and extra cards. It all fit fairly easily. I don't think I could have fit much more or a larger lens, though. I could probably fit just the 5diii and and a 70-200 if the lens was attached. It's reasonably comfortable for how much weight was in the bag. I biked around a city all day and i could definitely tell I was carrying it and was uncomfortable at times, but it never felt painful - just heavy as the day went on.
It's easy to configure - I will travel with the dividers in for protection and the body/lenses each in their own little cubbie, and then when I get to where I need to be and wish to start walking/shooting, I'll take out a divider and keep a lens attached to the body for ease of use.
Even when I'm not bringing my gear with me, I still like to travel with it. One divider for snacks, one for chargers and cables, and then the last for my headphones. Real easy to carry onto a plane and have everything I would need for the flight right at my feet. I REALLY like the little "tourist lock" where the zippers loop together so it's difficult for someone to open the zipper without you knowing. Super cheap little addition, probably cost Peak like 5cents extra, but a great little perk. It's a really well thought out bag.
It's fairly water resistant (Took it on two European winter trips where it snowed and sleeted like crazy) and even though I kept a desiccant pack in there for insurance, the inside of the bag stayed dry. It was pretty impressive. I wouldn't wear it in the pouring rain, but it will keep stuff safe in a drizzle.
This review probably sounds like a shill for the product, but I actually like it. I think a product like this should probably be around $100-$120, but I still think it's worth the investment if you need a multipurpose travel bag. I'd look at other larger slings if you need to carry more camera gear, or other stuff like a water bottle or laptop or whatever. The ThinkTank is significantly cheaper and looks bigger inside, but may not be as versatile with adjustment.