In misc.rural Gordon Couger wrote:
If you are working in them Levis 501 will out wear any of the others. When I
was feeding hay I would wear out 3 or 4 pair a year and nothing else would
last a month.

I really hate them giving money to PETA but as long as they buy cotton from
Plains Co Op I won't bite the hand that feeds me.

You could always find out how much they donate per pair, and double that
amount to an appropriate group. Following that up with a letter to Levi's
telling them that wouldn't hurt.