---
name: Sneak into basket
slug: sneak-into-basket
category: pattern
status: published
created: 2026-08-21T00:00:00.000Z
modified: 2026-08-21T00:00:00.000Z
definition: Adding an item the buyer never chose, an insurance, a donation, a
  warranty, into the cart through a preselected control found earlier in the
  flow.
aliases:
  - name: sneaking
    source: deceptive-design
  - name: added extras
    source: community
  - name: unwanted add-on
    source: community
tags:
  - commerce
relations:
  contrastWith:
    - drip-pricing
  variantOf:
    - dark-pattern
  partOf: []
  seeAlso: []
implementations: []
sources:
  - title: "Deceptive Design: Sneaking"
    url: https://www.deceptive.design/types
demo: inline
exhibit: false
useWhen: something you never picked is in your basket
---

Something is in the basket that the buyer never picked: parcel protection, a warranty, a
charitable donation, a magazine subscription, a printed certificate. It was not added by
accident and it was not added at the last step. It was added by a control the buyer passed
several screens earlier, already switched on, phrased so that agreeing with it looked like
agreeing with the page. The pattern is named for where it is noticed rather than where it is
done, which is exactly what makes it work: by the time the line item appears in the summary,
the screen that put it there is behind a back button.

Two things make it a deception rather than an upsell. The first is the default, which is the
mechanism: a [preselected opt-in](/preselected-opt-in) makes doing nothing into consent, and
doing nothing is what most people do on most screens. The second is the distance between the
choice and its consequence. An offer made in the basket, next to the total it changes, is a
legitimate offer even when it is a persuasive one; the same offer made three screens earlier
in a paragraph about delivery dates is a bet that the buyer will not connect the two. Add
[misdirection](/misdirection), where the eye is pulled toward the continue button and away
from the checkbox under it, and the extra line arrives with the buyer's technical consent and
nobody's actual agreement.

It has close relatives worth telling apart, and the distinction is what got added.
[Drip pricing](/drip-pricing) adds mandatory fees a screen at a time, so the item never
changes and the price keeps rising; sneaking adds a whole item the buyer could have declined,
so the basket contains something that was never wanted. [Forced continuity](/forced-continuity) charges for a
subscription after a trial nobody remembers starting. And where sneaking manufactures a
purchase, [fake social proof](/fake-social-proof) manufactures the reason for one. All four
belong to the family the site files under [dark pattern](/dark-pattern), and all four are
easiest to catch in the [order summary](/order-summary), which is the screen where the total
finally has to name its parts.

The tests are cheap and they are about defaults, not about wording. Every optional extra
starts off, so consent is an action rather than an omission. Every extra is offered where its
cost is visible, next to the total it changes. Every line in the summary can be removed from
the summary, without a return to the step that added it. And the wording is symmetric, since
a decline written as a confession is a different pattern doing the same job. Law has caught
up in places: the EU Consumer Rights Directive bars pre-ticked boxes for extra payments,
which makes the pattern illegal in that market rather than merely rude, and the catalogue at
[deceptive.design](https://www.deceptive.design) has tracked it under "sneaking" since the
term was coined.