When Business: Labels > Bags Meals Packing status : Show mark packed button is Yes, each item on the bag page has a Mark Packed button that turns into Packed when clicked (click again to undo). This works for meals, custom meal builder items, by-the-pound items and extras. If you also set Bags status : Don't allow to mark delivered until all items are marked packed to Yes, trying to mark the bag Delivered before every item is packed is refused with the message "All Meals should be packed before changing the status of the Bag #<number>". This gives you a scan-pack-deliver flow: scan the bag QR, tick items as they go in, then mark delivered.