Packing Slip vs. Pick List: What's the Difference?
The terms get used interchangeably, but a packing slip and a pick list are two different documents built for two different people. Confusing them is one of the quiet reasons in-house fulfillment feels slower than it should. This guide from the team behind Picksort lays out exactly what each document is for, how they differ line by line, and which one actually saves time when you're working through a stack of Shopify orders.
What a pick list is
A pick list is a working document for the warehouse. Its only job is to tell whoever is on the floor what to pull off the shelves and how many. A good pick list is organized around your physical space — grouped by SKU, vendor, or bin location — so the picker walks an efficient route and touches each shelf as few times as possible.
The key trait of a strong pick list is that it is consolidated. Instead of listing items order by order, it sums quantities across every open order so each product appears once. If forty customers ordered the same candle, the pick list shows one line — Amber Candle · 40 — not forty separate mentions. That single change is the difference between one trip to the shelf and forty. We cover the reasoning in depth in why one quantity-per-SKU sheet beats 40 packing slips.
What a packing slip is
A packing slip is a customer-facing document that goes inside the parcel. It itemizes exactly what's in that specific box — products, quantities, the order number, and usually the shipping address. Its audience is the buyer (and sometimes the returns desk), and its job is to confirm that the right items arrived and to make returns or exchanges straightforward.
Because a packing slip belongs to one order, there is always exactly one per shipment. That's correct for its purpose: the customer opening the box only cares about their own order. It becomes a problem only when a packing slip is pressed into service as a picking document — which is exactly what happens in a lot of small stores.
Pick list vs. packing slip, side by side
| Pick list | Packing slip | |
|---|---|---|
| Who reads it | The picker / warehouse team | The customer |
| Where it lives | On a clipboard or phone on the floor | Inside the shipped box |
| Organized by | SKU, vendor, or bin location | A single order |
| How many | One merged sheet for the whole batch | One per order |
| Main goal | Pull the right items fast | Confirm what shipped |
| Quantities | Summed across all open orders | Just that order's items |
Where the two fit in the fulfillment flow
The documents aren't rivals — they belong to different stages of the same process:
- Pick — Work from one merged pick list. Walk the floor once per SKU and pull the total quantity for every open order in the batch.
- Pack — At the packing station, split the picked items back into individual orders and drop a packing slip into each box.
- Fulfill — Mark the orders fulfilled in Shopify and buy your labels, ideally in bulk.
Notice that picking and packing are separate motions. Trying to do both at once — open an order, pick it, pack it, repeat — is the slowest approach at volume because it forces constant context switching. Separating them is a core idea in batch picking vs. single order picking.
The mistake: using packing slips to pick
Here's the trap. Shopify makes it easy to bulk-print packing slips from the Orders page, so a natural instinct is to print the whole stack and use it to pick. But a stack of packing slips is still one document per order. If your batch has forty orders that each include a best-selling SKU, you'll visit that shelf forty times and re-count the same product at every stop. The paperwork is technically "for packing," but you've turned it into a slow, error-prone pick list.
A merged pick list fixes this by flipping the organizing principle from order to product. This is exactly what Picksort does: it reads your open, unfulfilled orders and merges them into a single quantity-per-SKU sheet you can group by vendor, bin, or SKU, with checkoff boxes and big readable quantities. You still print packing slips to pack — Picksort doesn't replace them — but you stop using forty slips to do a job one clean sheet does better. If you want the manual route first, see how to print a pick list in Shopify.
Which one should you optimize?
If fulfillment feels slow, the bottleneck is almost always the pick, not the pack. Packing slips are already a solved problem in Shopify. The picking step is where repeated trips and re-counting quietly eat your day, and it's the step most stores never formalize with a proper consolidated document. Optimize the pick list first: group it the way your floor is laid out, sum the quantities, and print one sheet per batch. The packing slip can stay exactly as it is.
Frequently Asked Questions
What is the difference between a pick list and a packing slip?
A pick list tells your team what to pull from the shelves and in what quantity, so it's organized for the warehouse. A packing slip is a per-order document that goes inside the box to confirm to the customer what was shipped. One serves the picker; the other serves the buyer.
Do I need both a pick list and a packing slip?
Most stores use both, but at different stages. You pick from a pick list, then pack and drop a packing slip into each parcel. Small stores sometimes reuse packing slips as makeshift pick lists, but that means one document per order and repeated trips for the same SKU.
Can a packing slip be used as a pick list?
You can, but it's inefficient at volume. Packing slips are one per order, so ten orders for the same product send you to that shelf ten times. A merged pick list sums every open order so each SKU appears once with a total quantity, which is far faster to pull.
Does Picksort make pick lists or packing slips?
Picksort builds a merged pick sheet: it reads your open, unfulfilled Shopify orders and combines them into one quantity-per-SKU list grouped by vendor, bin, or SKU. It's read-only and needs no setup, and it complements Shopify's built-in packing slips.
If your team is picking from a stack of packing slips today, the fastest change you can make is to pick from one merged sheet instead. Start a free 30-day trial of Picksort and turn today's open Shopify orders into a single quantity-per-SKU pick sheet — then keep printing packing slips exactly as you do now.