First of all, bring the carrying bag, put it in the room, open it and put in it some thing with your smell - a towel or a shirt. Try to find a place for a bag somewhere near the resting place of your cat. But not on the place itself. Otherwise, the cat will begin to avoid the habitual place and start looking for a new rookery. If you can not put a cat near the resting place, place the carrying bag along the path of the companion animal, for example, to the place of feeding. Natural curiosity will overcome fear of a new thing and the cat will necessarily look inside. To make it even more interesting for him to find out what hides the unexplored new part of his home - put in a bag a treat for a mustached companion. Just do not put the bag in a remote corner of your presence or snacks. Otherwise, all the work will go wrong. Loneliness is not the best way to raise the sense of security of a socially active animal.
When the cat stops cautious approaching the bag and stops studying it, and perceives, as part of its usual interior, place the cat food inside the bag. It is best to put a plate near the back wall. A cat, willy-nilly, will have to completely load its body into the bag, because hunger is more cautious and suspicious.
After your cat stops perceiving the bag as a frightening thing and starts without fear of eating food, placed near the wall, try to encourage him to go in from time to time into it, even if it is empty and there is no food in it. Let the cat be soft and cozy in the bag. Even better, if sometimes, hopping into it, he will find a delicious meal, which you do not give him every day, and spoil sometimes. The cat will begin to perceive the carrying bag as a magical cat's chest, where you can eat and enjoy your daily cat's care.
Repetition is the basis of the cat's perception of carrying bags as a safe place. After you achieve a positive result, do not leave the bag for a long period. Otherwise, the cat will wean from it and again begin to be afraid. Repeat and repeat these simple and accessible actions for each person and his companion animal, and your journey to the vet or to the bride (groom) does not turn into a journey to Calvary.