Has anyone used one with rats? How big should it be and is there an age limit to when it stops being useful? I'm still struggling with Zuri and Pip as far as them absolutely freaking out about being handled. Both are perfectly fine with crawling on me when they're out with other rats, but as soon as they're alone it's like I'm the enemy again. Pip is also a biter and even if I can successfully pick him up and hold him for a minute, he eventually remembers that he has teeth. I think my lack of a bath tub may be the root of all this since I don't have an immersion space that really forces them to touch me and interact which is why I'm hoping something like a bonding pouch might be useful.