I have long hesitate before buying this bag because I do not visualizing its real dimensions for everyday use. I use it every day to go to work and I must say that this bag perfectly meets my expectations. It is of a size just fine, allowing me to move all my hi tech equipment like shelf, cords, PC and mp3 players. In addition it allows its various storage easily leave the keys, papers and anything else that we use every day. The central space allows to put a bottle of 1.5 liter water easily, as well as clothing (sweater or little jacket + gloves) or a meal in a box ..... tup This bag looks strong, finishes are quite correct and fits perfectly with the use of a daily companion. It is neither too big nor too small.