Recently the question came up on the Tousando forum as to how people carried personal items at SCA events while portraying a (pre 17th century) Japanese. My latest project can be seen here: http://www.wodefordhall.com/kake.htm
I am firmly convinced that in Japan, there is no sartorial problem that cannot be solved with a random piece of fabric, However, I wanted to make sure that nobody came after me crying, "I lost my car keys because of you!" This is why my design incorporates an anachronistic piece of cardboard tubing to assist it in maintaining some sort of structural integrity.
And I'll let you know if I lose my car keys.....