Don't be too hard on yourself. Could be that she jumped in a box herself. Figure out how you can get her attention to make her react so you can hear and identify where she is

I find shaking the Whiskers dry cat food brings the ******* to my yard from miles away. Try it. Hope you find your cat soon. :-)

Hope your cat was okay OP my cats do the same thing always trying to hide away somewhere you'd never think they'd be.

Think of some out of the box solutions to get him back..

The cat is in the box instead of the bag now :P I hope the cat won't be hard to find, if not already found. I'm not a cat owner but I'm sure it probably went in there by itself out of curiosity.

Let's hope you packed it with the cat food and litter box

No, I would say the cat packed herself. You know how cats love boxes!

I'm sure she's alright. Cats tend to love boxes. Mine sure do.

I swear this is the funniest FML I have ever read :))

So it's both alive and not alive at the same time at the moment?