When installed properly there is no slipping of the bag. I have tried to get it to slip and have failed. I'm puzzled at others complaints in this regard. The advice I received was to make sure you install it correctly & you won't have issues & that has been the case.The Bag is very nice. It's perfect for carrying a DSLR or Mirrorless camera and lens and all your accessories. It's also fantastic for carrying whatever else. It's padded, lined has an adjustable main compartment divider that you can move around to suite your needs. It comes with a rain bag. It has numerous small pockets and pouches that make this bag very versatile and really nice to tuck all sorts of things in it.I have had no issue wth the bag sagging as some have. My handle bars are tapered so you would think that would contribute to the bag sagging since the mount is only gripping part of the overall space it would normally grip,but mine has been perfect. I installed it with the bag tilted upwards as the instructions tell you to do. I installed the wire under the bar per the instructions and no issues what so ever. I know some put a strip of rubber between the mounting bracket & the handle bar and that stopped their bag from sagging, I have not needed that. It has a great locking mechanism for the bag that makes it easy to lock into place on your handle bars and with the press of a button it comes off with ease. It comes with a shoulder strap & the bag is very good to transport over your shoulder. It's a fantastic bag!The only reason I'm not giving it 5 stars is that the zippers are not the best. Topeak really could improve here. The zippers haven't failed but are a little "sticky" when trying to use them & so far that hasn't got better so I'm careful to zip and unzip at a bit slower pace in hopes of preventing any zipper failures. They haven't failed yet.Oh and the bag looks great on the bike. It's smallish in overall size but is perfect for me and I found my bike actually steers better with the bag on. I was concerned that the weight would make my bikes sterring worse & it did the opposite. I'm very happy with the bag, so a fantastic bag overall!