Standard poster sizes cover most needs, but plenty of projects don't fit neatly into 11 x 17, 18 x 24 or 24 x 36. A booth panel with an odd footprint, a lobby display built around an existing frame, a mural-scale print for a storefront window, or a small run-sized for a specific easel — these all call for a size built around the actual space and use case rather than a stock dimension. That's the role a custom poster order fills: the size, shape, stock and finish are set by the job, not by a fixed size chart. Material choice depends heavily on where the piece will live. Indoor posters generally do well on a coated paper stock, with matte lamination cutting glare under gallery or office lighting and gloss giving photography and bold color work more punch. Anything headed outdoors — a yard sign, a festival banner-style poster, window-facing signage — needs a weather-resistant substrate like vinyl or a laminate rated for UV and moisture exposure, since uncoated paper stock will warp, fade or tear within days outside. Shape doesn't have to stay rectangular either. Die-cutting can follow a logo outline, a product silhouette, or a rounded-corner panel to fit a specific display stand or kiosk. If a design calls for a cutout, it's worth building a small bleed and keeping any fine detail away from the cut line, since very thin points and sharp inside corners don't hold up well once trimmed. Because every dimension is custom, it helps to have the end use nailed down before the file goes to print: where it will hang or stand, how close viewers will typically be, whether it needs to survive repeated handling or weather, and how many you'll need now versus on a repeat order. Locking those details in early keeps the proofing process quick and avoids a second round of revisions once the first piece is mounted and you can see how it actually reads in the space.