Well since I buy a big load at a time I bought a large 5L plastic container to hold them in. I cut a big hole in the lid and taped on some metal flyscreen (**learn from my mistake- crickets will eat through plastic/fibreglass flyscreen. You do NOT want your 200 crickets sprinkled throughout your house when you get home from work**)
I keep the crickets in the container with some egg carton for them to hide in, and feed them carrot, mouse pellets and museli.
I find that the container gets very stinky even thought it's cleaned thoroughly with every new cricket batch, so I usually keep it outside in the shade, although I'm having some issues with ants at the moment.
When I want to get the crickets out for feeding, I put the whole container in the fridge for about 15mins and all the crickets slow right down so they're really easy to catch with some tweezers.