The Jack Master is the best masturbation sleeve I've used so far. It's a little heavy and hard to hide, but why bother when it looks like something you'd stick your action figures in? And yes, this one actually does come close to 'the real deal'.
The most helpful critical review
Flop Master Chomp Chomp
The Jack Master is an innovative design with multiple textures, a flexible, squeezable exterior and an easy clean TPR interior. Unfortunately, faulty hinges/closure tabs made it nearly useless for us as it would not stay closed.