I’ve had one for a couple of years. When I bought mine the guy told me. They are more water resistant than Waterproof. I don’t honestly know as I have a shell on my pickup bed. It holds a good amount of storage, but takes up a good amount of space too. That is to say it is taller than I realized it would be. They are built well. Good. Rollers on drawers and will support, I believe, 1000#, but it has to be dispersed correctly.
A wise old man once said…Shut Up and fish son! Well, maybe more than once.