I have to take a trip to the east coast at 4 weeks out. I never check luggage because of the hassle, so I needed protein that was under the 3 oz. TSA liquid limit to take with me. I found it on a bodybuilding website. Profect. It comes in several fruit flavors. Stats:2.9 oz, 100 calories, 0 carbs, 25 gr protein, plus vitamins. The official website is www.protica.com--you can order samples.
After I ordered those samples, I found Gotein and ordered a sample pack of that too. It's a powder that you add to water. It comes in individual serving sizes. I got the samples at http://www.gotein.com/sample_pack.html for $3.00.
This won't weigh down my carry-on bag, and I won't have to worry about getting my protein in. I'll be on the soft solids part of my diet, so I figured I'll be able to eat in restaurants as long as I'm careful what I choose. I thought I would share this tidbit in case anyone has to travel early out.