A system for processing wireless data packets allows for processing packets allows consolidation of security processing. The device may be fabricated in a miniature form factor suitable for attachment to a small organ such as a lateral gastrocnemius muscle of a live rat. The pleats provide a transverse curve length that is radially variable with a greatest transverse curve length toward a first end of the wall and a smallest transverse curve length toward an opposite end of the wall so that expansion of the wall is biased toward the to first end.