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

Currently there is no way for you to choose what gear items you take with you to a place on Roblox. Instead, all gear items you own that can be brought into the place will be in your backpack. You can drop individual gear items by selecting them and hitting the backspace key.

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