Since the lid is covered deeply against the box, rain will not invade even if there is no packing. The part of the buckle is slightly shallow, but there are things that are behind the buckle and there was no problem at all even in the rain running for several hours. If you are uneasy, you should close it with a sponge tape. It is a sink mark at the time of molding, the bottom is a little rippling. It does not affect the strength, so I do not feel it is a problem in particular. As Iris's box products in general, when you open the buckle, apply force with your thumbs from above and hang the other fingers underneath, but at this time, the bottom finger between the buckle and case I will get caught. Also, when releasing the buckle, it stops at a position of 90 degrees sideways, but if you inadvertently catch the luggage in this state, the buckle will be easily damaged. Moreover, in case of this RVBOX shallow type, locking can not be done for indoor use as a precondition. The company's sealed RVBOX with key 460 eliminates all of the above dissatisfactions and is a wonderful thing made more airtight and stronger but small size is a drawback. I urge you to have a sealed RVBOX large size sold.