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Combines multiple input items into a single output item. Use this step when the items flowing through your route need to be grouped together before the next step handles them, for example to send products to an external system in batches of 100 instead of one at a time, or to bundle a day’s orders into a single file. It collects the items as they arrive and emits them together as one item, with the collected items stored under a path you choose.

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This step combines the items passing through a route, so it runs as part of a route rather than on its own. A typical configuration that bundles incoming items into batches of 100, stored under an items path, looks like this: With this configuration, every 100 incoming items are combined into one output item whose items path holds those 100 items. If fewer than 100 items remain at the end, they are combined into a final, smaller batch.