INSTRUCTIONS: For three days, carry all of the things you normally carry in a wallet or purse in a non-standard receptacle. This receptacle could be a paper bag, a burlap sack, a cup, a piece of soft food, your hand, etc. This task will not be accepted and scored if the receptacle is too standard! No pockets or prefabricated bags - nothing that can be construed as being engineered for carrying credit cards, cash, driver's license, and whatever else you have in your wallet. Extraordinary proofs will be scored accordingly - significant bonus points for baking your personal effects into a cake that you bring around and eat to access items when necessary.
It took awhile, but I realized that there was only one thing I could use for an antiwallet... A book! It's unoriginal, but I love books, and as an added bonus it kept me from reading ahead of where I was supposed to for school since it was rather a pain to read with all of the stuff stuck in different pages of the book.