If you plug two extension cords together like this, they won't come unplugged by accident.
When you're done they're easy to unplug.

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DUMBEST. THING. EVER.
I spent a good 10 minutes just laughing at this product, and couldn't comprehend what fool would spend his money on something that takes at most 15 seconds to just tie the cable ends in what you have pictured here.
The boxes were not waterproof. They were not particularly well secured either, as it had to be a 'one size fits all' product, so I can imagine the cables coming unplugged INSIDE the box if you tugged hard enough. It was not crush resistant. It didn't even look like it was that well made.
thanks for this good reminder. Not only do plug want to unplug, they tend to ground out if the ground may be damp. We get busy working on projects and forget about the limit of the cord.