If you already know what a wallet is, go to Creating a New Wallet.
A wallet is a a transparent folder/envelope, also sometimes known as a "pocket", which contains the original muddy survey notes and sketches which were made down the cave on a survey trip.
All the original notes and sketches are all filed in the clearly marked wallet as soon as possible after a survey trip. Rip them out of the notebook, don't take them caving again and don't leave them lying around to be "Gössered" in the hut. Photogrpah them with your phone or scan them witht he flatbed scanner in the hut immediately and upload the scans.
The notes (all of them, including dates, personnel, calibration, LRUD, station details, etc.) should be filed away in the wallet in the current year's surveys binder. You should include a transcription on a sheet of paper if they are illegible (to other people; if you can't read them yourself, go back and do the survey again!). Even if you do this, never throw away the original notes.
All the wallets for one expo live in a ring-binder which is klept in the potato hut on expo.
Back to the previous page in the New Survey sequence
Creating a new wallet in the online system.
Take a side trip to the online wallet maintainers' notes.