I've thought pipe cleaner holders was one of the most useless accessories until I started keeping some in my jacket with my lighter and pipe tool. They are mostly mangled and a pain to use now that they're not straight. I'll probably be ordering one of these soon.
Case is 14cm while a std pipe cleaner is about 15cm so if you're not adverse to a quick trim, try this option for a lightweight case to keep them straight, clean etc while in a pocket