I had very good success with bagging, at least until we started having complete and total weather related crop failures a few years ago.
I will say that it got just a little worse every year. The last year I had earwig damage that was significant. Earwigs are smarter than the average insect.
I never thought about cutting a hole in the side . I always trimmed off the lip above the zip lock and stapled along the top. I don’t know why the side cut wouldn’t work.