If you are looking for cargo pants as work pants, military surplus is a good way to go. The US military (and i assume this trickles down to other countries) spends a lot of money developing uniform fabrics that are abrasion resistant, puncture resistant, etc. They also have reinforced knees. I'm sure there is a range of quality depending on what manufacturer produced what lot, but they all have to meet good standards, and all US uniforms will be made in the US.