I've been using my super six k factor bag and I think its time to switch to a new one. I am looking at Federer's new bag...and the cosmetics are ok. Anyway, I was just wondering about the quality of the ECO bags, I've never actually touched one but they look so flimsy. Can someone just give any feedback on these bags...it would be even better if you can put some input on the Federer bag. I am very tempted to buy a babolat bag. Those things look solid.