"Innovative, Interlocking, Stackable" Universal Game Piece Holders.
Comes in sets of six pieces (in a ziplock) which can be assembled in various ways to serve as card, tile, or piece holders. Available in several colours (white, black, grey, brown, red, orange, yellow, green, blue, purple). Mesh draw-string bags are also available.
UberStax.com, Sherwood Park, AB, Canada
One of many ways a set of six can be assembled:
The ten colours: