If you were calling it flimsy because it doesn't stand stiff and straight, that's actually a GREAT thing.
I'm a young mom and I can't tell you how many times my diaper bags were spat up on, spilled in with mystery liquid of the month and just generally beat up and whatnot.. I've had two kids and neither one of my storebought diaperbags held up to the rigors of motherhood, and I didn't use either one of them for more than 9 months each.
I think they would have lasted longer if I was able to wash them, and it appears that your bag would be machine washable, which is INVALUABLE.
I love how it turned out, and if this was me, I'd definitely feel that I was getting my money's worth and more.