On 1250 from ORD to JAX in F this evening and a hot sandwhich was served with a small salad and brownie. I saw they were serving the $3 snacks and asked if I could get some chips with the sandwich. I was told no 'they have to account for them back there'. Well nevermind how the accounting is done on the $7 drinks. Is it UA policy not to allow a bag of chips in F when they give out the drinks? Weird.