Something else I find quite helpful is to label the backpack that I use for Foliar Feeding with huge letters "NUTRITION ONLY". The other one has a huge "I Kill Plants" indicating that I am using Round up in that one. The one I use the most is the NUTRITION ONLY pack, I figure its keeps me from ever getting them mixed up, and also keeps the neighbors from freaking out on my constant spraying. Nothing like walking around the side of your house spraying and run into a neighbor with a baby stroller and a dog on a leash when you are wearing a backpack full of a dark colored liquid! Its bad enough Sequestrene drenches look like huge buckets of blood!