A free sample file (get the full version here) showing a lying flag. PSD file with smart layers. Dimensions: 1500 x 1001 px at 150 dpi.
Mockup of blowing flag on a pole. Layered PSD file (background also changeable) with smart object. Dimensions: 2000 x 1339 px at 300 dpi.
Free sample mockup showing a hanging flag. 4000 x 4000 px sized and fully customizable PSD file with smart layer.