Just use the sea-bag you were issued. It fits in all C-2's for transport to the carrier. You were issued a sea-bag weren't you? This is www.navycommuter.mil right?

assuming your airline allows you to use a backpack for your roll-aboard.

i'm in the process of looking for one too, an upgrade guy staying in my crashpad showed me his luggage works bag that he's used for the last 3+ years. it looks like it's only a couple months old. he noted that if you attach your flight kit to the roll-aboard, consider one that will stand up to having a 20-30lb bag hung off it 4 or more times a day for months on end. (something i never considered)

they're pricey too ( >$300) but if they last most of your career, it's worth it

Please change the batteries on your sarcasm detector.