You can produce usable packaging visuals before a single box exists, by putting your artwork onto a 3D box mockup and exporting the angles you need. Use them for your website, social, ads, pitch decks and pre-orders. You cannot use them as an Amazon main image, which must be a real photograph of the actual product.
Every physical product business hits the same wall in the same week. You need photos to launch. You need a printed box to photograph. You need the launch to justify the print run. Nothing can start because everything is waiting on everything else.
Here is how to break it honestly, and where the line is.
What a mockup can legitimately do
A box mockup takes your flat artwork and maps it onto a three-dimensional box with realistic lighting and shadow. The output looks like a product photograph because the geometry and lighting are real; only the box is not.
That is genuinely enough for most of what you need at launch:
Your own website and landing pages. No rules against it, and visitors understand that hero imagery is produced.
Social and ads. Fine, as long as the product you ship matches what you showed.
Pitch decks and investor material. Expected. Nobody asks a pre-launch founder for studio photography.
Pre-order and waitlist pages. Fine, with the obvious caveat that the real thing has to match.
Supplier and retailer conversations. Often more useful than a sample, because you can show three variants in a single email.
Crowdfunding pages. Platform rules vary and change, so check the specific platform.
Where the line is, clearly
Amazon requires the main image to be a professional photograph of the actual product. Illustrations, renders and mockups are not permitted in that slot. This is well documented and listings do get suppressed for breaking it.
Secondary images, A+ content and sponsored creative have more latitude, but the main image is a photograph of the real thing, out of its packaging, on pure white. Plan for that. It means a physical sample and a camera before you can list.
Other marketplaces have their own rules and they are not identical. Read them rather than assuming, because an image policy violation usually arrives as a suppressed listing rather than a warning.
And the general principle underneath all of it: the box you show has to be the box you ship. If you render a rigid box and post a flat-printed mailer, you have a returns problem and a trust problem, not a photography problem.
The workflow
Settle the structure first. Mailer, folding carton, corrugated shipper or rigid. They look different, cost differently and have different minimum orders. Rendering the wrong one wastes the work.
Get the dieline from your supplier. Build artwork on their template, at their dimensions, with bleed. Starting from the real dieline means the asset you create is the asset you print.
Check the flat file. Bleed past every cut line, nothing important on a crease, every panel the right way up when folded, barcode flat and inside the safe area.
Render the angles you actually need. Not twenty. Four covers most launches: a three-quarter hero, a straight front, a closed box in context, and an open box showing the inside print if you have any.
Export large and keep the source. You will re-crop these for a dozen aspect ratios.
Order a physical sample anyway. Before a long run, and before any marketplace listing.
How to do step 4 without Photoshop
This used to mean buying a PSD, opening it in Photoshop, finding the smart object layer, pasting in artwork, and hoping the warp looked right.
You can skip that now. A free box mockup generator runs in the browser: upload the artwork, pick a box style close to your structure, export. For a founder who needs four images by Friday and does not own Photoshop, that is the difference between launching and not.
The thing to watch for is matching the style. Pick the template whose proportions and construction actually resemble what your supplier is making. A tall rigid gift box and a flat-ish mailer photograph very differently, and picking the pretty one over the accurate one is how you end up with a mismatch between the ad and the parcel.
What this does not replace
Being direct about this, because the internet is full of people selling the opposite.
A mockup will not tell you whether the finish feels cheap. It will not tell you whether your blue prints as the blue you chose. It will not reveal that the tuck flap is too tight to close one-handed, or that the board flexes when the product goes in. Every one of those has killed a launch, and none of them show up in a render.
Use mockups to move fast before the sample arrives, and to produce the marketing images you would struggle to shoot anyway. Use a physical sample to decide whether to print a thousand of them.
The order that works
Structure, dieline, artwork, flat check, render, launch assets, sample, print, photograph, marketplace listing.
Most people try to do it in the reverse order and get stuck at step one waiting for a box they have not paid for yet.
If this was useful, I also wrote up how to present packaging design to a client, which covers the same renders from the other side of the table, and how to read a packaging dieline for the flat-file check in step 3.