using dryer lint is good for learning purposes. However, deliberately packing dryer lint, if you have cotton balls available in large quantities, borders on irresponsible.
Agreed when it comes to packing cotton balls. If you're going to pack tinder, pack cotton balls. Take different stuff too if you want, but cotton balls are just too efficient not to pack. I stuff a couple into the elasticated pocket in the back inside wall of my Leatherman sheath, using an old trick I learned here at ETS (I think I need to credit Bird, but baby brain is making my memory foggy) - stuff them into snipped and melted plastic drinking straws. You can cram them just about ahywhere and easily carry a few without much effort.