Patent ID: 8622877

Claim:
A plurality of exercise articles, each of the plurality of exercise articles comprising: a body having an interior volume, the body comprising a first and a second panel of material adhered together by stitching near a periphery of the body, the stitching following a generally nonlinear pattern of stitching, the first and the second panels having a generally circular shape; and a collapsible inlet which is in open communication with said interior volume and which is movable from a first position in which it extends from said body, to a second position in which it extends into said internal volume, the inlet comprising one or more sheets of material comprising lateral edges adhered together forming one or more seams; wherein said inlet is configured such that when the inlet is in the first position, the one or more seams are inverted; wherein the first and second panels of at least one of the plurality of exercise articles have a larger outer diameter than first and second panels of at least one other of the plurality of exercise articles.