A big campaign is the golden window when sales can multiply several times over in just a few days — but it's also when sellers get hurt the most. Picture this: your ads are firing at full blast, customers are flooding into your shop, but your best-selling item shows the words 'Out of Stock' — meaning you're paying for ads just to hand customers over to your competitors.
The question is: how do you prep your stock just right — not so little that you miss sales, and not so much that your money gets tied up? This article breaks it down into 5 steps you can use for every campaign throughout the year.
1. Forecast Sales from Real Data, Not Gut Feeling
The starting point of good stock preparation is numbers, not guesswork. Pull historical data from past campaigns to see which SKUs sold like crazy, and multiply by your shop's growth factor for 2026.
- Look at peak sales, not average sales, because on campaign days sales cluster far higher than usual.
- Separate by channel — the sales proportions on Shopee, Lazada, and TikTok Shop are often not equal.
- Add a buffer for ad-driven products — the items you'll push hard with ads need more stock reserved than others.
2. Prioritize Your SKUs Using the ABC Principle
You don't need to stock everything equally. Divide your products into groups by importance, then pour your resources into the group that actually makes money.
| Group | Characteristics | Stocking Approach |
|---|---|---|
| A (The Hero) | Best-sellers, making up 70-80% of revenue, e.g. SKU-TOP01 | Reserve the most; never run out |
| B (The Supporting Cast) | Sells steadily but not spectacularly | Reserve a moderate amount |
| C (The Long Tail) | Sells only once in a while | Stock little; avoid tying up money |
This way, your capital gets concentrated on Group A products that truly make your shop sell well, instead of being tied up in slow-turning long-tail items.
3. Calculate a 'Buffer Stock' for Uncertainty
Suppliers deliver late, sales exceed expectations, goods get damaged in transit — these things always happen. The solution is to reserve Safety Stock, or buffer stock.
- Assess your supplier's Lead Time — how many days until the goods arrive.
- Reserve enough stock to cover that period plus fluctuations, especially for Group A.
- Set a Reorder Point in advance; don't wait until stock is nearly gone to place an order.
Most importantly, don't let goods arrive at the warehouse at the last minute, because in the run-up to a campaign every warehouse is packed, so receiving and counting goods will be slower than usual.
4. Get Ready for Packing and Shipping
Having the goods but not being able to pack them in time is game over. The big problem during campaigns is orders surging tenfold in a single day, while your packing manpower stays the same. The result: late shipments, negative reviews, and a dropping shop rating.
- Prepare enough packing materials — boxes, bubble mailers, tape, address stickers.
- Place best-sellers where they're easy to grab to cut down on walking-and-picking time.
- Rehearse the process, from printing shipping labels to scanning barcodes and handing off to the courier.
5. Let a Fulfillment System Absorb the Shock
Once your shop grows to a certain point, managing stock and packing yourself during peak periods becomes a bottleneck. This is where a warehousing and fulfillment system like Flash Fulfillment steps in to lighten the load.
- See your stock in real time — know how much of each SKU is left, deduct stock automatically across all channels, and reduce overselling.
- Flexible packing capacity — handle order surges during campaigns without having to hire extra staff yourself.
- Connected to multiple couriers — goods leave the warehouse faster, protecting your delivery times and shop rating.
Simply put, you focus on marketing and choosing products that sell well, while the heaviest back-end work is left to the system to handle.
Key Takeaways
- Forecast from real data — look at past peak sales, don't guess.
- Prioritize SKUs with ABC — invest heavily in the hero products.
- Reserve buffer stock and set your reorder point in advance.
- Prepare packing and shipping to handle a flood of orders.
- Use a fulfillment system to absorb the shock during peaks.
Good stock preparation doesn't start on campaign day — it starts with planning weeks ahead. The stronger your back-end system, the more boldly you can fire your ads without fearing stockouts or missed shipments.
If you'd like to know just how much a warehousing and fulfillment system can help your shop handle a big campaign smoothly, consult the Flash Fulfillment team to set up your back-end system before the next peak.
Frequently Asked Questions (FAQ)
How far in advance should I start preparing stock before a campaign?
It depends on your supplier's Lead Time, but as a general rule you should allow enough time for goods to arrive at the warehouse, be counted, and be arranged at least 1-2 weeks before campaign day, because as the peak approaches every warehouse gets packed and receives goods more slowly than usual.
Too much stock risks tying up money, too little risks running out — what should I do?
Use the ABC prioritization principle: reserve plenty of stock for the hero products that drive most of your revenue, and reduce the quantity of slow-turning long-tail items. This helps put your capital into products that truly sell well.
If orders surge so much I can't pack them in time on campaign day, how do I fix it?
Plan your packing capacity in advance, arrange best-sellers so they're easy to grab, and consider using a fulfillment service with flexible manpower that can handle increased order volume without you having to hire temporary staff yourself.
Can fulfillment really help with stockouts?
It helps in terms of real-time visibility into stock data and automatic stock deduction across all channels, so you can spot the signals of near-depletion and reorder in time, reducing the chance of overselling or running out mid-campaign.
