Size · Number of pockets etc. For use as second back, it is problematic, easy to use, design is good, sufficiently satisfy the function as waist bag. On the functional side, there is a handle whose necessity is unknown on the left and right (application unknown). There are situations where it is difficult to open or close the fastener, or the problem of the position of the main entry / exit. Especially when you store bulky items such as slips · large books, fasteners do not open, in many cases you take out the result belt and take out it. The anti-slip on the back is more effective than it looks, and it can be evaluated that it will stay well at the waist.