Sounds like it would be enough. I usually bring two racquets, one can of balls, two 1-quart water bottles, lead tape, overgrips and one or two shirts. It's probably bigger than I need. The Wilson bag holds my stuff and it's probably smaller - it just doesn't hold its shape.
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @54, Prince Syn Gut 16 @58