It’s cheap but it will be your best friend when it comes to cleaning onaholes not-so-easy-to-clean. In general, onaholes you can’t easily flip “inside out”, like Fera Zoma, Greatest Stroker II, Kozaru,..
The instructions are quite easy: fill with water, close, stick into onahole, press, do again until onahole clean even at the innermost parts. Can also be used for anal washing, or as discrete water-pistol (because it actually shoots strong, straight horizontal you exceed 2 meters away easily).
Lightweight and cheap, can at least help you getting closer to weight level limit for shipping.