A:AnswerWhen folded up it is still 22" long. It isn't very wide. If 22" is too long for your backpack you can always live the zipper unzipped on the one sice and let the end of the tripod stick out.
A:AnswerIt can be used but I can't recommend this tripod. This is the worst tripod I've ever had. It broke on my second time using it. I'd recommend a Ravelli Lightweight Aluminum Tripod if you want to stay on the lower end of tripods. I've had that one for years and it has not failed me. :) Good luck!