The Crane Backpack is an tool added by the OpenBlocks mod. It can be used to move blocks and mobs around.
To operate the Crane Backpack, you must use a Crane Control. It provides an alternative to the Safari Net. It is crafted using a piece of leather, 3 Lines, a Crane Magnet, a Crane Engine and 2 Beams. Holding the Crane Control, right-clicking will raise the Crane Magnet and right-clicking while sneaking will lower the Crane Magnet. When lowered onto a block or mob, left-clicking will attach the Crane Magnet to the block or mob.