How do internal-frame backpacks compare to rolling suitcases for overseas travel?

I'm moving overseas, and I'm considering what type of luggage to buy. I already have one large rolling suitcase, and I'm thinking about buying a large frame-type backpack instead of another suitcase. I don't know anything about backpacks and I haven't traveled much either, so I don't know if this is a good idea or not.

Some things I don't know: How does the capacity of a backpack compare to a suitcase? Can I check the backpack for the flight? Is it too big to be a carry-on? What other factors should I consider?

Any information would be helpful. Thanks!

Hi, well where do I start. I guess is tends to depend on where you are travelling to - but having said that it really probably doesn't matter. I have travelled extensively throughout Europe and when I was 19 I took a rolling suitcase. It was a disaster. My husband and I each purchased a very good (not super expensive but probably middle range) back pack with a zip on/off day pack. (we got ours at Mountain Designs). We usually start our travels with about 7 kilos because whatever goes into the pack ultimately goes on your back..... We have been to Malta and Italy and many other places where we were sooo glad that we had backpacks. We've been on and off trains in record time all because of our packs. We also use the day pack (that zips on the front) as cabin luggage but also when we get towards the end of our trip and have over bought we zip the day pack back onto the main pack and have a small couple of bags that have been stored inside the main pack that we can use as cabin baggage and therefore have an extra couple of bags but still only having one bag in the hold of the aircraft. We absoluely recommend back packs. My parents and friends have tried to work with rolling suitcases and they have had to resort to getting taxis EVERYWHERE because of it. This can become extremely expensive. We just jump off a train/bus and we're off to walk to the hotel/hostel that we are staying at. However, if you are staying in one place for, say 2 weeks, and you have transfers to and from your hotel then a rolling suitcase would be the way to go with maybe a small day pack as hand luggage. That way you can put the day pack on your back which will give you both hands to operate the rolling suitcase (you may need it). They both have their place depending on the holiday you are doing. With regards to how big they are you may need to check with the airline as to how much they will allow as cabin luggage, but be aware it isn't too large and a maximum of 5-8 kilograms for carry on usually applies. It you are moving overseas for a long time and want to take lots of things you could always consider sea freight. It takes about 12 weeks to London so you will need to plan ahead. A good tip! Pack your bag with what you think you will need and then half it. You can always make do with less - trust me - I know this sounds harsh but you will be glad you did. Hope that helps. Good luck and happy travels!