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they are about the same. it really depends on the type of backpack or parachute backpack you are talking about.
Mybe the materials on which they use to make a backpack
I was crying because I lost my backpack.
Can you grab my backpack please?
I stuffed the book in my backpack.
a see through backpack
When you get to the right rank, you get the backpack as a reward. The backpack is permanent (and free).