Where can I find a good gym bag? Seems like by now I would have found the perfect one, but I've had issues with the last few (discontinued, ripped apart too easily, etc.) but I'll be carrying one around more now.......Fairly large (minimum 18" X 12" X12", but up to 50% bigger is great), durable, enough pockets, not plastered with supplement or clothing company names all over it.....any suggestions? Thanks!