Never Tear Us Apart

For the love of Pete - they can put a rover on Mars, why can't they make the lining in a bag of cereal in such a way that it's possible to tear it easily and symmetrically instead of an uneven jagged tear that results in cereal being spilled all over the counter?
How about it all yea masters of engineering? Stop working on improvements to shopping carts to fix the inevitable loose wheel that spins counter clockwise from all the others and get to work on this.
And make that two Mars rovers - so step it up.

song: Never Tear Us Apart • artist: INXS