Be bursting/bulging at the seams slang
A seam is where two pieces of fabric are sewn together.
To be having too many people or things.
I avoid going to landmarks on days like this because I know they will be bulging at the seams.
Forget about that beach! It's bulging at the seams in this season. I'd like to go somewhere less crowded.
This slang started to become popular in the 1800s.