The dimensions of the inside are 13.9" x 14", adequate for legal paper, right? Sure, but probably not the way you want to.
I already have a fireproof safe, but lately it is unable to hold all of the important documents. I have a stack of legal size papers (8.5" X 14") that is about two inches thick. This doesn't fit in my (slightly) smaller safe well at all, so I found this safe, sized to fit legal papers. It also has file folder hangers built in! But I can't use those at all. I am stuck with laying all of my legal paper size things in the bottom and letting them curl up on the ends.
You see, the concrete (or whatever material it is) insulation that is blown in to this plastic casing causes the casing to bulge inward. The stated interior dimensions are 13.9 x 14 at the very top, but not halfway down the side of the interior walls. It is 13.4 x 13.5 at that point. (Sort of like a 2x4 being 1.75" x 3.5") Even the bottom bulges up, so a hanging file folder hits the bottom before it is hung on both rails, definitely a design flaw. Beside that problem, the hangers would only hold A4 or Letter size hangers, NOT Legal size. The hangers are oriented so that the paper would hang sideways, in the 13.9" nominal direction, minus 1" for the lid mechanism to have room to move in. The only way legal papers could fit is in the other direction, and that is if the walls didn't bulge inwards, and no hanger rails in this direction.
Now when I put my hanging file folders in there...they become leaning file folders instead. (Try hanging a 9" folder in a 7" drawer)
I won't test the lock assembly, but it does appear to be a fire and flood safe, not a burglary safe. Look elsewhere for that purpose. As stated in the instructions attached to the lid on arrival, you have to push down while unlatching due to the (I assume) very effective waterproofing seal. I like that it can be closed, latched, and waterproof without being locked.
All that said, I'm going to keep this unit because one that DOES fit things nicely would cost four times as much. A price I'm not willing to pay at this time.