The phrase "pocket opening" refers to the small opening or slit in clothing, bags, or other items where you can place things like your hands, keys, or small objects for safekeeping or easy access.
Sentences with «pocket opening»
With a reverse envelope pocket opening in the rear of the diaper, the inserts are easy to install. (tinytush.com)
What are the benefits of front and back pocket openings? (diaperjunction.com)
It does have 2 pocket openings for those that like them. (diaperjunction.com)