The cart is the last stop before payment. The shopper has already decided to buy. They are looking at what they picked, checking the total, and reaching for the checkout button. That moment is a good one for a small, relevant suggestion, and a bad one for anything that slows them down.
This guide covers what to recommend in a cart drawer, the ways to choose those products, and the mistakes that turn a helpful suggestion into clutter.
Why the cart drawer
A slide-out cart drawer opens over the page the shopper is on. They see their cart without leaving the store, so adding one more item takes a tap, not a trip back to a collection page.
Most theme drawers show the items, a subtotal and a checkout button. Some show a few recommendations. Very few let you decide which products appear, why, or at what price. That is the gap a cart drawer app fills.
The cart also knows something the product page does not: everything the shopper picked. A recommendation there can respond to what is already in the order, not just to one product page.
What to recommend
Good cart upsells share three traits. They are cheap next to the cart, they go with what is already in it, and they need no thinking.
- Complements. Replacement heads for the toothbrush in the cart. Socks for the shoes. A cleaning kit for the sneakers.
- Consumables and refills. Things that get used up, at a price below the main item.
- Small treats. A low-price item the shopper can say yes to without comparing. Lip balm, a candle snuffer, a tote bag.
Avoid alternatives. A second serum next to the serum in the cart is not an add-on, it is a new decision. It invites the shopper to reconsider the first one, and sometimes to leave both.
Four ways to choose the products
In Bundlex Cart, the Upsells block can fill itself from four sources. Most stores start with one and add rules later.
- Hand-picked products. You choose a short list. Simple, and you can set a percentage off each one, which applies only when the shopper adds it from the cart.
- A collection. The drawer suggests products from a collection you maintain in Shopify, in the collection's sort order.
- Shopify recommendations. Related or complementary products from Shopify's Search & Discovery app, based on the first eligible product in the cart, skipping gifts and add-ons. Set your pairings there first, see recommending products based on the cart.
- Targeted offers. Your own rules, which can look at every product in the cart. "If shoes are in the cart, suggest socks." "If the cart value is under $50, suggest the $9 candle." The cart value here is counted before cart-wide discounts and leaves out free gifts, so it can differ from the subtotal the shopper sees. See targeted upsell offers.
Products already in the cart drop out of the list by themselves, so the shopper never sees a suggestion for something they have. The full setup is in adding product upsells to the cart.
A rule worth trying first: pair your upsells with a free shipping bar. When the bar says "$9 away from free shipping", a $9 to $12 suggestion right under it closes the gap.
Layout and how many
Three or four suggestions is plenty. On a phone the drawer is narrow, and every card pushes the checkout button further down.
- Vertical list for two or three products you want read.
- Carousel when you have more and want them to take little height.
- One at a time when a single, strong suggestion is enough.
On desktop there is more room. A side upsell panel sits beside the drawer, so suggestions do not compete with the cart items at all. It only shows on screens wide enough for it, so keep the regular Upsells block on for phones.
One-tap add-ons
Some extras are not products the shopper browses. Gift wrapping is the classic one. In Bundlex Cart, the Add-on toggle shows it as a checkbox near the checkout button: tick it, and a paid line joins the order.
A checkbox converts well because it is a yes or no, not a choice between products. Keep it honest. The add-on is a real product your store sells and delivers. If you offer your own delivery protection, your store handles the claims. The Add-on toggle guide covers the setup.
Mistakes to avoid
- Suggestions that cost more than the cart. A $90 upsell on a $30 cart is a second purchase, not an add-on.
- The same three products for everyone. If every cart shows the same items, they stop matching what people bought. Use rules or Shopify recommendations once you have a few pairings.
- Too many blocks at once. Upsells, add-on, rewards bar, countdown and badges all at once bury the checkout button. Turn on what earns its place.
- Discounting everything. A small discount on one hand-picked upsell can help. A discount on every suggestion trains shoppers to wait for the cart.
Measuring the results
Watch two numbers: how often shoppers add a suggested product, and the average order value of carts that include one. If suggestions get clicks but rarely get added, the price is too high or the match is wrong. Try a cheaper product or a different rule before changing the design.
You can click through a real drawer with demo products on the Bundlex Cart page. Bundlex Cart is currently free to install; see pricing for plans.
