How to get a bag?

The bag is obtained after completing a certain number of levels from quest rewards, you can get it from a chest or daily chest. The bag can be merged up to 10 levels where it will start to produce items for instant photos such as photo cartridges. Those photo cartridges can be merged to level 5 where it will turn into an instant camera. You can then use the instant camera to produce photos. Once the camera has produced a number of photos it will disappear.