Why are super strength bin liners as thin as a condom and with all the strength of wet rice paper?

Why...
Are bin liners so weak?
Every pack of bin liners my wife buys has packaging screaming, super strong, extra strength, tear proof. The Superman of black bags... yet unravel the roll and instead you get an anaemic Clarke Kent sack that will tear if you fill it with only cotton candy.
I assume ‘normal’ strength bags are so fragile they are only suitable to stick wishes and dreams into.
Is there no scale of strength for refuse bags? A minimum level of actually being able to hold something heavier than a ping pong ball?
There you go EU bureaucrats! Do something more useful than determining the curvature of a banana and give minimum strength requirements to bin bags.