It's tempting to slap your existing t-shirt designs onto every product a POD platform offers, but phone cases and tumblers have their own quirks — what works on a chest print doesn't always translate, and knowing why saves you from listing products that just won't move.

Phone cases: think vertical, think edges

Phone case print areas are tall, narrow, and interrupted by camera cutouts near the top — a wide, centered design built for a shirt often gets awkwardly cropped or squeezed into that shape. Designs that actually perform well on phone cases tend to either fill the whole case edge-to-edge (patterns, gradients, all-over illustrations) or work as a smaller, centered motif lower on the case, away from the camera cutout. Text-heavy designs are genuinely risky here — anything meant to be read clearly needs to sit in the safe zone your POD platform's template shows you, not just look fine in the general preview.

Tumblers: wraparound is the whole game

Tumblers print on a curved, wraparound surface, which means a design has to work as it bends around a cylinder — flat, front-facing designs built for shirts often look distorted or awkwardly split at the seam. Repeating patterns, seamless wraps, and designs with a clear "front" that gracefully fades or repeats around the back tend to perform best. A single centered chest-style graphic, ported over unchanged, is one of the more common tumbler design mistakes.

What tends to actually sell on both

  • Name/monogram customization options — surprisingly strong sellers because they add a personal element cheaply
  • Small, repeatable motifs (little skulls, stars, florals) that read well at a smaller scale than a chest print
  • Text-based designs with short, punchy phrases rather than long sentences that get lost in the wrap

What tends to flop

  • Direct ports of detailed illustrative shirt designs, unadjusted for the different print area
  • Anything relying on fine detail that gets lost at a smaller product size
  • Designs with important content too close to a phone case's camera cutout or a tumbler's seam

The short version: treat each product type as its own small design task, not a resize-and-upload job. It's more work upfront, but it's the difference between a phone case listing that sits at zero sales and one that actually earns its spot in your catalog.