woah sorry I forgot I posted this, busy week!!
Anyway, like I said I understand the need for the rack systems in large collections but if you have a small collection of like 10 or so, I believe the storage bins are the most "humane" way. Rats do like stand up and stretch, I see mine do it ALL the time. I know I would get really frustrated if I couldn't stand up lol. I'm not saying all of you are inhumane people, I was just thinking one day and thought of a diffrerent way which I find a little more humane I guess.
And to the gentleman saying that they can fall more easily to neglect I don't understand you reasoning here. In your case when having to deal with mass amounts, I understand the need for space, and easy clean factors in for you so it deffinately makes more sense to do it your way. But for me cleaning these bins every week is no problem at all, and by no means do they get neglected. I have a screen top that I made, and hoppers as well so ventilation is fine. Like I said the only thing that I find inhumane really is just not being able to stretch out and stand up. Again not trying to insult anyones set-up at all just seeing other peoples views on this.