Yeah, it is useless. It makes it really hard to use any bottle holder besides those cheapo wire loops they package them with, which only work with a wire cage. Which is ok for my rats, as they're in wire cages. But for mice in aquariums or the rack, its pointless.
I like the bottles, as they're pretty rigid and sturdy. But as the baby rats chewed the top ends off of a few of my blue ones, I'm just thankful their spouts fit the clear ones. I HATE throwing useful things away, so I've had a few of those spouts sitting around waiting for a use. =P
The tubs I'm using now are the same depth as the 12qt and 28qt Sterilites I was using. As I've pulled the stickers off, I'm not sure of the model # anymore.
Here's a pic of my latest incarnation, messy I know.
Before, I had 5 12qt's down the left, and 5 28qt's down the right. But when hubby built it, he didn't make size allowances for sliders that the lip of the tubs would fit into.
As a year wore on, the tubs didn't fit well anymore and started to fall out occasionally. So he put in the risers between the bottom levels and the bottom of the tubs to hold them into place. They slide really well and everything fits very tight. So far the mice are really enjoying the room to move and I don't have to clean but every 2 weeks so far.
But true to our closeness to Kentucky, the whole thing fits with our decorating scheme, don't you think? =P