I really want to like these bags

I really want to like these bags. They're nice and sturdy however I had I really difficult time trying to open these bags. I bought the 55 count first to trial them. I just finished the box and out of 55 over 12 of them tore when I tried to open them due to the tough seal. Towards the end of the box I also noticed some of the milk leaking thru the top of the plastic where the ziplock and bag are connected. Now I'm paranoid about the previous bags I had stored and if there's any possible compromise in the bags. Definitely frustrated!! I really don't know if I want to repurchase these or not.

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