Delivered folded flat, it goes up very simply: there are just zipping the zipper. There is a little plastic smell when unpacking so I advise you to mount it in advance and ask him into a corner where he can be aired a few days before using. As seen in the picture there is a magnet on the front that allows folding the entrance niche mode. This is not a detail, as this allows you to use as basket cat outside times when you carry it and this is what makes your cat will be confident in and will not associate the bag to the visit to the vet for example !! Let your cat to appropriate it and use it daily. It makes all the difference, because if you store and only remove it for RDV vaccine is part of frenzied hunting, scratches and resentment that await that day.