I carry 2 Israeli Parachutist Messenger Bags. One is my paperwork management bag and the other is my electronics bag.
The paperwork management bag has: Log book, steno pad, spare glasses and sunglasses, bic lighter, driving gloves, chargers for cell phone, and a few other items.
The electronics bag has: laptop computer, power supply, cd's, bic lighter, and other electronic items.
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QMC, USCG (Ret)
The best luck is what you make yourself!