considering getting a clamshell of fresh spring greens?

I have read a bit on the forum and this is probably somewhere that I haven't gotten to, but what about a clamshell(the plastic "box" thing that keeps greens fresher for longer rather than those bags of greens that are horrid) of fresh spring greens? OH one other question I hear this going back and forth about fresh spinach, can I feed my bun my spinach?

OH one other thing that I have done that my bun likes, is I have a paper plate with hay in it that I mix his celery which he loves into it, It's like a game for him to eat his hay until he finds the treats. He likes it I think?

Yup those plastic thingys are fine.
I find if I add a paper towel to the bottom of them they stay fresher a little longer vs going soggy.
Spinach in moderation is okay. So an all spinach diet is a no no lol

but the rest is safe for Cole to eat? good it's easiest to buy in bulk.