I like the Riggs brand work pants or carpenter pants made by Wrangler. Nice big front and rear pockets. The back pockets are reinforced with cordura or something to prevent tools from quickly wearing through. The also have an extra gusset in the crotch for plenty of room and maneuverability. They are a rip stop cotton. Very comfortable and extremely durable.
I wear them almost everyday and everywhere.
Sold at Orscheln Farm and Home stores and Menards. At least around here. $38 to $40.

Its not always easy to do the right thing, But it is always the right thing to do.