Lunar's size is perfect - this small bag fits my phone, keys, documents, a 480 ml water bottle, tissues, some cosmetics and a compact windbreaker (Rab Vital Hoody) which is basically everything I need for a day out.
I really appreciate all the anti-theft features with one exception: the zip clip and zip tab system. As others have already mentioned in reviews, it’s extremely difficult to open. This isn’t my first pacsafe bag - I’ve been using the CX backpack for over a year and learning the locking system there took only a few minutes. That’s why I’m a bit frustrated with Lunar. I watched the instruction video but I'm still struggling with unzipping it when it's locked. That said, judging by positive reviews from other users maybe it’s just a matter of practice and I’ll eventually get the hang of it too.