I ordered two camera backpacks, this one and the large bag by Ececase. They looked similar and to some extent they were. I wasn't sure they weren't the same under different packaging. They aren't the same. The Evecase is smaller. Both have a separate take out case. The Evecase is just that. This backpack has a pull out waistpack and can be used around your waist which is handy if you need more room. I don't think think this backpack is going to fit under an airline seat. In the end I choose this backpack because of several reasons. I needed the additional room and wanted the option to include a change of clothes for when we are flying. This pack is capable of remaining balanced on the end to allow easy access to your camera from above without laying it down. I have rectangular filters in a substantial case which fits better on end. I am also able to fit my Canon 70-200m end on end, plus 3 more lenses, flash unit and controller, plus other camera related items in the upper opening. I put my lenses case in the lower opening. There are a bunch of other storage places, room for a drink on one end and tripod on the other. The zippers were easier to work on this backpack. There was also more room a coMputer in this pack. I have a 13" regular computer and a 10" pad which both fit in the computer opening. Although they fit in the other bag I couldn't close the zipper. The back supporting straps are more comfortable on this bag. The other bag cut into my chest. I think it may be a defective.This bag comes with a huge number of velcro dividers both above and below, many more than I needed.In the event you have to check the bag under the plane on smaller planes, the top is better padded with a rubberized top.This a big bag and fully loaded it can be heavy. I hope I can handle all the weight. Our first trip out will be this weekend..The other bag is a nice bag. It is a bit smaller and you may be able to fit it under a seat.I do have suggestions for an even better backpack. 1. Make the carrying handle more substantial. 2. There are two sleeves in the upper storage area, one of which is open. I plan on sewing some velcro to close off the second open storage sleeve. 3. the straps that hold the tripod need to have quick release belts, not the existing double hole belt which are slower to operate. Again I am going to replace them with the quick release variety.