Cart Upsell adds in-cart upsells, product recommendations, bundles, and gift offers inside a customizable cart drawer. Merchants can create offers by product or collection, cart rules, quantity, cart value thresholds, and customer conditions, then choose where they appear in the cart experience. Use it for add-on offers, buy more save more prompts, and gift-with-purchase messages. The app includes announcements, styling, layout settings, and controls to enable, disable, and schedule offers.