If you are in a suitable area like the middle of knowhere stick and flick is the best method, I would'nt do it in a park or popular dog walking area so use plastic bags. Sadly plastic is casuing far more problems than dog poop, the so called bio degradable bags are even worse as most just degrade to smaller pieces of plastic !
Most of the smelly poo in our area comes from foxes, sadly our dog has a liking for rolling in it !!