Why is the UPC code always at the bottom of the beer box?

I worked in retail stores for a while and noticed that every time a customer grabs a beer box, the UPC code is always at the bottom of the box or at the opposite side of where the handle to grab on is. Why is that the case?

submitted by /u/Fun-Skirt3742
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source https://www.reddit.com/r/beermoney/comments/1c61lk2/why_is_the_upc_code_always_at_the_bottom_of_the/