I liked them well enough and attached them to my rack with the hardware that they came with. As mentioned, make sure that they're back far enough that you don't have to deal with heel strike. Oh and grab a couple bungee nets. For me these and a regular backpack were the best commuting solution. Threw the lock in the bottom of a basket, dropped the backpack on top of it, secured it with the bungee net and I was off in a few seconds. Get to work, undo the bungee, throw the backpack over the shoulder, lock it, and you're off just as fast. More convenient than a cycling specific backpack that claimed to lift the bag off my back but still left me with a soaking back or panniers that were great on the bike, but either took longer to get off the bike, weren't as secure on the bike, weren't as convenient to carry, or all of the above. Of course, they are heavy, but sure are convenient, and I could load them with groceries to beyond the carrying capacity of my rack without them bending.