The phrase "bulging bag" means a bag that is really full and looks like it might burst because there are too many things in it.
Sentences with «bulging bag»
Then we raffled of more prizes to add to the already bulging bags. (mommyniri.com)
You can't have too much inflight entertainment for young children: If you wonder why parents of young kids travel with five pieces of luggage, it's because three of those five bulging bags are filled with toys, books, games and gadgets lest junior gets bored for more than a second and all hell breaks loose. (havebabywilltravel.com)
I felt a bulging bag of water right inside, but the head was still a few inches up behind my cervix. (birthwithoutfearblog.com)