I use Dwayne's Photo (
A trusted name in photo processing for over 50 years - Dwayne's Photo) for my developing. For every roll (35mm) I send them, I write some identifying information on the plastic canister which contains the roll. For the return trip, the results of each roll is placed in it's own envelop, with the same identifying info written on it.
Typically, the only info I care about is which camera I used and the date I finished the roll. For example, I'd write "KX 11-16-14" on the canister, and that's what is on the envelope when the work is returned.
I should point out that this happened completely by accident. I had written the info on the canisters for my own benefit while the undeveloped film was still in my possession, assuming that the canister would get tossed at the lab and that would be the end of it. I was pleasantly surprised to find the information copied to the envelops when the developed film was returned.
And turnaround time isn't too bad. I recently mailed three rolls on a Friday (from Maryland to Kansas). Dwayne's received it on Monday and had the results in the mail to me that Friday. That worked out nicely, as the weekends were used for shipping time.
EDIT: I neglected to mention the CDs... Dwayne's does not label them. But you can do that yourself since the envelop has the information you need.
Fred