You travel with 8 sticks? Wow. You are a much, much better player/better prepared player than I've ever been (and I earned ATP points in the 90s).
Back when bags were skinny, I agree with tennisnj, you needed two bags or one huge duffle.
With the behemothbags in fashion today, I easily fit 4 sticks and a dozen wristbands and overgrips on one side (thermo-lined), all my extra clothing/accessories and an extra pair of size 14 shoes in the middle, and four or five Nalgenes and some sports drinks in the other thermo-lined side. I feel ready for five hours plus. I've used the same bag for an entire weekend trip, complete with casual clothes and jeans. I use poly and gut, and 4 sticks is plenty, really.
Anyway, I feel a traveling player at our levels needs more bag than a pro in some ways (2 matches per day plus dubs), unless you store half your stuff for a long week/weekend of tennis in your car or hotel room. Keep in mind, most pros have access to a lockerroom ... and they generally only play one match per day.