
yesterday at our club show I bought a card which the breed stand was selling especially for this purpose.
basically it is a laminated postcard size card with the breed logo on it and it has two holes punched in it at the top with key ring fobs attached so that it can be secured to any crate.Also it came with a marker pen and cost £2.50
The stand sold out of them in about 10 mins and will be taking more to crufts but I reckon you could make something similar at home in a few minutes.
You don't have to put your phone number or bench number onto the card as a contact name will suffice.Some exhibitors had made their own and personalised them with their affix or photos of their dogs.