I have heard so much about using gauze in ink bottles from friends I have to try it out myself. Instead of using an actual ink bottle, I used a solvent container that is used for outdoor oil painting. It has a clip underneath it so I could clip it on my sketchbook or drawing board when I am sketching outdoors. Instead of gauze, I used facial cotton that works the same as gauze. Now I can bring my sumi ink (or chinese ink) out in my bag without the fear of spilling it and soiling my stuff in the bag. The gauze would ensure that there is no excess ink on the brush or bamboo pen when I dip into the container. So no mess when I draw, even when I clip it on my sketchbook. Quite a nifty method of bringing out ink to location drawing trips.