If by "backpack" you mean "Ava's Attractor", this can be obtained by completing the Animal Magnetism quest.
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you can't really get a backpack on runescape. But i did know this guy named "the box noob" on runescape who was really famous back in 2006 because he glitched out a few wielded weapons from a quest. some are: the grain sack which u could wear on ur back and the brown chicken which u could hold in ur hand. and also this box that he could hold
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for all the help i need with runescape i go on runehq.com
The lost tribe members quest. Also Death of Dorgeshuun quest.