So I did a bad thing.. I bought another bag!
Once again, it's a structured satchel, this time I got it from the Cambridge Satchel Company and it is b-e-a-utiful! I really am so pleased with the quality and size of the bag. It's a 15" in the colour Vintage and it has my initials embossed on the front. I ordered the bag exactly a week ago, and it arrived yesterday, so I am incredibly impressed! The company suggested a manufacturing time of two weeks, even before it was shipped, so you can imagine my surprise when the bag arrived on my doorstep yesterday! It cost me £114 + shipping which equated to roughly $204, which is a little pricey, but I think this bag will last a really really long time. So I've kind of justified it to myself.