How do bugs get inside a sealed plastic bag?

Sometimes when food is being processed like flour ,wheat, corn etc. The bugs and bug eggs that are on the plant before it gets harvested don't always get ground up or killed in the manufacturing process, so when the box has been sitting for a couple years the conditions improve enough for the bug eggs to hatch...there was also probobly enough room for air to get in that a couple bugs might have found their way into the box as well, i work in a food area and we have to keep our walnuts and pecans in our receiving area, but tlet those babies sit for a month because someone forgot them and we'll have a flour moths all over...it sucks...but hey bugs will happen

They chew really tiny holes in the packaging and thats how they get in. You may not have seen the hole at first but try looking very closely for a tiny hole. Either that or they may have gotten in if the package wasn't sealed tightly. The bugs also could have reproduced several times and thats why you may have found so many.

remember that you may not have seen any holes but they only need a teeny tiny opening to get in. And also don't use pancake mix past the expiry date even if it looks okay. It may grow spores and you will become extremely ill

hope i helped :)

The conditions and the content were already predisposed for this to happen. It happens often. Especially in any flour like items.

You are okay here worry not. ;-)

may be ur bag or watevr is open so other way mean throug zip or windows of ur bag