A double sided design can be created by creating two separate designs in the PosterMyWall editor. These designs need to have identical dimensions, so printing is possible.
The best way to create a double sided design is by creating the front side (or back side) and save. Then go to 'file' > 'duplicate design' to create a copy of your design. Edit the copy and use it as the other side.
We offer double sided prints for bulk flyers. On the 'buy prints' page, select 12x18" double sided prints available under bulk flyers and posters. When ordering prints, you will be asked to specify both sides of the flyer.