I use a Tupperware container for mine. I have a larger one and cut out a section of the top and added a screen to provide air circulation or it will stink bad.
I also add in crushed corn kernels from the pet store to reduce smell.

I buy my crickets in either the 500 or 1000 count box to save money and just put a piece of potato in along with a cap filled with gutload.

The cricket keepers will lose crickets from where the handle meets the top of the keeper. At least that was where mine escaped from.