Method and apparatus to efficiently store and cache data. The backpack includes an optics storage compartment having an interior that is accessible from a front of the backpack and first and second tripod leg attachment structures positioned below the optics storage compartment for securing first and second legs of the tripod against a corresponding first and second side of the backpack. The memory cell further includes at least one keeper layer. The second position is spaced radially outwardly from the first position such that the bit head is displaceable through the body in a direction along the casing axis. The preferred pre-seed layer is CrTiAl.