I got this belt bag months ago when it first landed in COS. To be honest it was a practical purchase— the perfect travel companion for my trips to and around London, saving me the angst of digging around in my bag for travel ticket and phone. But not only has it been useful in a practical sense, but also a great piece to wear as a style statement— especially over coats. I love it worn with this one from Me+Em.
If you’re looking to invest in a belt bag, there are plenty out there. This one is sold out sadly (although now available in red), but here’s a few great ones worth considering: