It helps when some products are out of stock or pre-ordered.

Partial fulfillment means shipping only part of an order initially.

Yes, merchants can fulfill orders in bulk.

Pick lists help warehouse staff collect items for orders efficiently.

Pick lists help warehouse staff collect items for orders efficiently.

Yes, packing slips can be generated and printed from Shopify admin.

UPS, USPS, FedEx, DHL, and others integrate with Shopify.