On our trucks, we keep all our soldering material, such as solder, paste, pipe cutters, emery cloth, inspection mirror and other miscellaneous items, in small tackle boxes. To keep our flux brushes clean, we have travel toothbrush holders we put the brushes in. We take a piece of duct tape and put on one end, so when you put the brush back, you always put the business end in the duct tape side so the handle stays free of flux.