Racks arrived today. I agree with
@Saoliver, they are much thinner than any other rack I have (chipco, Paulson, Brybelly, Bud Jones, and unnamed $1.50 racks from Spinettis). Stacked 6 high when I slid the chips back on the shelf, the bottom rack made some unpleasant sounds, like the plastic was being folded under and then springing back. I was afraid it would crack, but I kept sliding it back (worst case scenario is it would break and I would then have 99 racks).
It did not break.
Aside from that, they are an incredible deal for the blow-out price. If you shipped chips in these, I don't think they would survive, but for storage in a birdcage, or to have scattered around a room to make color-ups or table moves eazy, these are a no-brainer. I have replaced 10 of my $1.50 racks (those never stacked straight, they always stacked in a zig-zag pattern) with these, and they are now in use in my birdcage.
If you are on the fence, these are an excellent deal - even if you only need a third of the case.