I bought this in Seapine/Red for a 2 week trip to Europe along with a Techonaut 30, and love both. First, I love that I can pack not only TB packing cubes, but also the LGD inside the Techonaut 30! It means I can stick the filled LGD inside the backpack to avoid having a third bag for airline travel purposes, with minimal fuss, then take it out already packed at my destination for going around town.
I also love the versatility of the different ways to wear LGD. So far I have mostly worn it sling-style on the back, and around my waist at the front. After some getting used to it, I found it very easy to adjust the strap at the bottom while wearing sling-style to tighten and loosen slightly to make it the most comfy while walking or take it off over my head. It is a large pack, so not super slim against the body, but very comfortable to carry even very full and for a long day walking about town.
I love that I can swap from sling to waist if my shoulder gets tired. It's also great for visiting places with bag restrictions: it's small enough to slip under the radar of places that make you check larger bags, and for museums that prohibit bags carried on the back you can just carry in front on waist or shoulder no problem.
It fits a ton; although not an extra sweater or jacket, you can tighten the cinch straps around one to carry it securely and easily. In my pic I show what I carried on a typical day: long wallet, small knitting project bag, sunglasses case, folding shopping…