If you're a member of BJ's Wholesale Club, this little fun fact should entice you.

Whether you shop at the North Dartmouth, Plymouth, Taunton, Seekonk, or Middletown, Rhode Island locations, this life hack will significantly come in handy the next time you have a shopping cart full of groceries.

At the front of the store, up by the cash registers, is where you'll find that metal rack full of empty cardboard boxes. These are free for customers to use to stack their purchased groceries and items to better help get them home. Of course, you should use your reusable bags if you have them.

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However, if you've ever asked yourself why those boxes only have three sides to them, you're not alone. It's been a burning question of mine for quite some time and when I finally asked the reason for the incomplete free boxes, I felt a little dumb.

"Most of the boxes have three sides because that's how the product comes shipped," Former BJ's Wholesale Club Manager of 17 years Heather Machado said, "Others will have four sides, but they are either perforated or cut open before placed in the designated aisles on the shelves for easy access to pull the product out."

Here's where the good news comes in.

There are in fact full four-sided boxes, but only on a first come first serve basis.

"The only four-sided boxes you will see are if the bakery puts their boxes in the bins after a delivery comes in," Machado said.

So, if you're someone who's wondered why you rarely see a complete box in the "free" bin at BJs, here's your answer. The goal moving forward is to figure out the exact time the boxes get brought over from the bakery after they've been emptied.

The more you shop, the more you save, and the more you know.

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