I’ve been using Sticker Mule for my polymailers since 4 years ago. At first they were the best, perfect. Now lately I have encountered many differences:
1. The small polymailers come even smaller than they used to
2. The material is now thicker, not allowing to close it smoothly 
3. I found ink bleed on my polymailers. Totally ruined
4. How can they even pass this quality check and send them like these?
I’m definitely thinking of not using sticker mule for my polymailers with all these happening

Ink bleed, terrible quality check and smaller than before