Start with the Display Goal
The display goal is the single most useful filter you can apply before you look at any specific product. It answers the question: what merch do you actually want to show, and how do you want it arranged?
If the setup is mostly pins or badges, flatter messenger, crossbody, and convertible shapes are usually the easiest first buy. Flat merch does not require depth — it needs a clear, wide window and a solid insert to pin into. The window size relative to your collection is the main variable.
If the setup is built around plushies or dolls, depth matters more than a slim profile. A plushie that is 12–15cm tall needs a window with corresponding height and a bag with enough interior depth to allow the plushie to sit naturally rather than being squashed flat against the window panel.
If the setup is photocard-focused — common in K-pop fandoms — almost any bag format works, but the window clarity matters most. Photocards are flat and slim, so they show up well in any window size. Choose a bag where the PVC window is thick and scratch-resistant enough to remain clear after extended use.
If the setup mixes merch types — pins plus a few stands, or photocards alongside button badges — look for a bag with a window large enough to accommodate some depth variation and an insert sturdy enough to hold everything without bowing under the weight of multiple item types.
Color should refine the shortlist, not create it. The bag that fits your merch is more useful than the bag that only matches the aesthetic mood.