The Backpack trolley is therefore very unstable. The material is not very stable. Sorry, there was right the first time using one of the zippers broke. Have the bag since Saturday (ie 2 days). The other zippers are much better terms of quality. The handle does not look very tough out, but you have with me can bear 10kg, the wheels turn not round, thus the trolley when rolling very loud. For 35, - Euro one should not expect to get a luxury bag, however. The volume is very noisy but not so disturbing. All in all, you have to make concessions in quality. But if you're looking for an opportunity, this trolley is not so bad. Since I use the trolley almost every day, I will write in the near future here a little bit. After another week in the use of the trolley is torn everywhere and no longer use. Got rid of him.