The t-shirt

The t-shirt is the product design’s worked example, and the second funnel on the live demo. It is where a catalogue starts to tempt you, and where Cartless declines.

The trap

Cartless allows three axes at checkout — size, colour, fit — and the fourth is a catalogue. Print looks like a third axis, and it fits; but print was never an axis — a design is a product. Each design gets its own funnel, its own copy and its own ad set. Size × Colour for one design is twelve SKUs and a funnel, and it is the better business regardless of what the plugin would allow.

Stock per combination

Navy being in stock and XL being in stock does not mean Navy XL is. What you can sell lists every combination; untick the ones you do not make, switch on Count stock, and each gets a number that sales take down. The buyer sees a combination only if you make it, and cannot pick one that has sold out. Stock moves when the money does — nothing is held while somebody reads the page, and every move is logged.

Money before, content after

The name on the back costs $8, so the bump takes the money before payment. The name itself changes nothing about price or fulfilment, so the thank-you page asks it, where it costs no conversion. The order shows the answer under What the buyer told you, and for a short grace period the buyer can still correct it.

The same split works for engraving, monograms and gift messages.

The second shirt

On Pro, the upsell offers another shirt after payment. It inherits the size — that does not need asking again — and lets the buyer choose a colour. One click, charged to the card already used, recorded as a second charge on the same order.

A tax wrinkle

In the UK, children’s clothing is zero-rated and adult clothing standard-rated. Sell both from one funnel and you have the coffee funnel’s mixed-rate basket; Cartless taxes each line at its own class, so it works, but keep an eye on which product carries which class.