UPDATE*** 09/15/2016 ***
I have now purchased these containers in three different Cal, .45, .223 and .308. And I have to say they have held up great! Not one single issue at all in all of them. I have stacked them at least 7 high without issue. I also forgot to mention that they are o-ring sealed inside the lid and should have no issue at all keeping out the moisture. I have thrown a couple of silica packets in with each of mine and they shoudl be good for several years no problem.
I really like how the handles fold down flat out of the way and the lids have small tabs on top to help keep them stacked and not let the one on top slide off. It stays put. So if you need a ammo can to store your ammo and want something that will last forever without issue, I highly recommend these. I even bought a couple of the .50 cal ones without any inside it to use as my range cans. I pull a couple of boxes from the cals I am going to shoot that day and throw them into the .50 cal one and away I go. I have dropped it, had it fall off the back of my truck, and not one problem. These are the best method of storing ammo that I have seen!!