Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: I did buy the camera bag but am wondering if it can be used as a carry on on the airplane?
Document: I bought this as a carry-on for my photography gear while traveling. The main compartment can carry a camera with attached zoom lens and four other lenses. The top compartment can carry personal gear or more lenses, although it is just an open area. For a recent flight I used this bag for all my travel needs. It felt comfortable against my back. However, for my 5'7" frame it felt slightly small.Its strength is its design quality.
This backpack is good for bundling laptop and DSLR camera for long trips. I recently embarked on a trip to India for 4 weeks and this bag has turned out to be an outstanding performer. I carry my 15 inch Macbook pro and Nikon D7000 DSLR + 50mm prime lens + 55-210mm zoom lens. Let me highlight some flaws. ** CONS **[1] I have my Nikon camera fitted with prime lens.
There is sufficient space to carry all this ...[2] The camera compartment is pretty spacious. You can ideally setup DSLR camera + 55-210mm lens on the main camera slot. In the lens slot you can keep another telephoto zoom lens. There are four smaller slots around it which carries my battery charger, lens filters and other two slots are empty. [3] The bag has a very solid construction and feel to it.
Because you cannot fit a few other common things in the upper compartment I wish I had purchased a smaller backpack only for the DLSR and accessories. This item will still be great for airplane travel.
The outside pockets can hide flight documents, sunglasses or boarding passes that are quickly needed at the airport.This is a well-made bag. The red canvas matches my red carry-on bag and both carry enough for a week-long get-away.
There are plenty of reviews describing how great this bag is so I'll add my voice to that - I purchased the Fastpack 250 to make traveling easier. I now have a solid camera bag and laptop bag and the backpack works very well for long and short travel.
I bought this bag about 7 months ago and have completely fallen in love with it. I shoot almost entirely video with my Canon T3i and I use this as my only camera bag. It fits the body comfortably and could also support larger cameras.
The pack is exactly what I needed. Not only did I need something for my laptop, but it's perfect for my camera, and as someone I read said, it doesn't 'scream' Camera Bag! Looks like an ordinary day-pack, or backpack, and the straps are comfortable as well. So far, well worth the investment.
I purchased this bag with my Cannon T2i and there is plenty of space in it for the camera, extra lenses, and other accessories. I like that it can hold my laptop and there is space in the top compartment for other items. I took this bag with me to NYC and it feels surprisingly light on the shoulders. The waist straps are a nice thought, but not particularly useful.
Having the laptop sleeve was key. I would say that the only downside of this bag is the lack of tripod/monopod straps, but it's possible to loosen the buckles on the back flap and slide a pod through them, which I've done a couple of times. Overall it's a great camera bag that's comfortable and carries everything I could ask it to and more.
Answer: I will find out very soon since I will be traveling with the bag.  I have used a similar sized bag in the past and have had no problems using it as a "personal item."