I carry two for my PT-140 in my weak-side rear pocket. If one turns their pants pockets inside out when the pants are washed the lint buildup is pretty much eliminated. I shoot what's in the magazines every couple of months and just use compressed air to blow them out. NOT wet lubricating magazines cuts down on lint collection. The only lube I ever use is a little dry graphite applied to the sides of the follower.
Now would putting it in your pocket be a good idea? Could there be a risk of lint over time causing it to jam while feeding? I supose that one could disassemble the mag and clean it ever once in a while.