Improved polymer-based materials are described, for example for use as an electrode binder in a fuel cell. By uniformly arranging vias around the bump on an integrated circuit, current can uniformly flow to and from the bump, effectively leading to reduced current density around the bump. The first extension is the cryptographic separation of VLANs over trunk links. The processing circuitry may determine whether the user is climbing stairs based on the user’s step rate and the user’s changes in elevation. The bag has an integral top flap that opens to cooperate with the insert to form a closed box, and has carry handles connected to the interior of the bag that are either removable or can be located within the bag when it is converted into a box.