On a previous trip, one of our tour members almost had his contents stolen from his daypack that was on his back. Therefore, I decided to buy a PacSafe Vibe 28L commuter backpack with its security features for my recently completed trip and for a future trip to a foreign country. I wanted a backpack like my current carry on bag that unzips on three sides that folds out like a suitcase, with a handle and shoulder strap. The Pacsafe bag has all those features except for the shoulder strap. I always keep my bag protected under my seat in the airplane instead of the overhead bin where someone could throw their bag over my bag and possibly damage my camera and lens. I like the PacSafe bag compared to my other bag because its dimensions are smaller especially the width of 12.2 inches compared to 14 inches. Unlike my other bag, I can place the PacSafe on its side and it fits under the seat leaving room on each side for me to stretch my feet out (very important on a long distance flight). The PacSafe material is so much lighter to carry than my other bag. Since the length is shorter at 18 1/2'", it doesn't stick out from under the seat. I like the interior straps that secure my jacket and the zippered pockets to hold my cell phone and other items from falling out.