Got my girlfriend the Ambi for Christmas this past year. She prefers slings and needed something larger (or perhaps I needed her to have something larger :lol: so I didn't have to carry her rain jacket and lunch in my pack).
Anyway, the idea behind the Ambi is you can set it up for either shoulder and can access it by slinging it in either direction. Most of the pockets have zippers on both sides or that wrap the whole way around...so the bottom of a pocket in some cases is a zipper, and not stitching...important to remember. Practically, it makes the most sense to set up all the zippers for the pockets based on which shoulder you're gonna wear it, and which direction you're gonna sling it, and stick to that.
It's big...similar storage room in the big compartment to my Bean Kennebec backpack. Takes a rain jacket, lunch, can of beer easy and could take far more...double that probably. Water bottle pocket holds a full size 32 oz Nalgene, which is nice. It rides in the middle of the back, fairly high, with good strap support. That's one of my complaints of many slings...they ride low on a hip and you end up inadvertently dunking them.
I paid close to sticker price I think...got it at BPS with some other stuff and got over the threshold to get 15% off or something like that on the entire purchase. At sticker price there are other packs I'd buy first for myself (I like backpacks with a few pockets on the straps up front) but packs are very personal preference, and this is what she wanted, and will probably be perfect for some folks. She loves it, FWIW. And so do I now that she's carrying her own lunch and jacket!