all these other links besides the booq bags one, the sleeves seem kind of cheap. The radtech isn't strong, just a thin material that acts as a sleeve, and the others are kind of like neoprene. The booq sleeve is nice. It is pretty strong and durable. If it were to drop in another position besides flat, then your notebook may get beat up. But, other than that they are really good. I haven't been able to find another sleeve that is as good as the booq ones, and competitive in price.