Good Collapsible Cleaning Rod?

I use a Crown Saver to clean my RAW.

There is no such thing as a good breakdown rod. Get a one piece rod .

I'd go a step further and submit that a cleaning rod should never be used on an air gun. Cleaning rods were designed/developed for fire arms (powder burning) which use much harder metals for the barrel. The risk here is that the cleaning rod could damage the crown or possibly the rifling. Additional air guns does not accumulate gun powder residue and thus allow for much milder cleaning methods. My recommendation is a draw through cleaning kit (https://www.google.com/search?q=air+rifle+pull+through+cleaning+kit&ie=utf-8&oe=utf-8), these kits work great, are very compact and make it impossible to damage the barrel.

I also use a crown saver and would never use a rod. When I use rods on my powder burners, I use a rod guide and clean from breach end. 

Wooden dowel and just put in the case? Cheap, safe and effective.

I keep a full-length rod under the cushion of my gun case. Its nowhere to be seen but can be easily withdrawn from there.

80lb test fishing line, doubled and a straw to get past the moderator. Oh, and If you can find a straw long enough. 

You can always cut wooden dowels or delron rod to whatever length you need. They should be strong enough for clearing a stuck pellet err slug. But if it's a cleaning rod you want, Dewey has some that are nylon coated https://deweyrods.com/product/35-caliber-nylon-coated-rod-36-inches/, but not collapsible.