ListBombHow to Organize Resale Inventory When You Sell on Several Sites
Short answer: give every item a code, store it in a numbered bin, and keep one master list that shows the code, the bin, the price and every site it's listed on. When it sells, find it by bin and mark it sold everywhere from that list.
Selling on more than one marketplace gets you more buyers, but it also multiplies the ways to lose track of things. The usual problems are an item you can't find after it sells, the same item selling twice, and old listings still live for things that left months ago. A small, boring system fixes all three.
1. Give every item a code
Before an item gets photographed, give it a short code. A simple format is bin number plus a running number: B04-017 is the 17th item that went into bin 4.
- Write the code on a hang tag, a sticky label on the bag, or masking tape on the item.
- Never reuse a code, even after the item sells.
- Keep codes short enough to type on a phone.
On eBay, you can put the same code in the Custom label (SKU) field. eBay community mentors explain that it can be turned on from "See title options" next to the Title box in the Seller Hub listing tool, or added as a column on the Active Listings page, and that it holds up to 50 characters. Then the code shows up next to the sale, and you know exactly which bin to open.
2. Store by bin, not by category
It's tempting to group shirts with shirts and shoes with shoes. That falls apart once you have hundreds of items. Instead:
- Use same-size bins or boxes and number them on two sides.
- Fill bins in order. When bin 4 is full, start bin 5.
- Bag small or loose items in clear zip bags with the code on the bag.
- Keep a separate "to list" area so unlisted items never mix with listed ones.
Your list tells you where things are, so the shelf doesn't have to.
3. Keep one master list
A spreadsheet or notes app is enough. One row per item, with these columns:
| Column | Example |
|---|---|
| Code | B04-017 |
| Item | Men's rain jacket, size L |
| Bin | B04 |
| Cost | $6 |
| Price | $45 |
| Listed on | eBay, Mercari, Facebook |
| Listed date | Nov 12 |
| Status | Active / Pending / Sold |
| Sold on, price | eBay, $42 |
The "Listed on" column matters most. It's your checklist for what to take down when the item sells.
4. When something sells, update everything at once
Make this a habit you do every time, right away:
- Mark the row Sold with the site and price.
- Remove the listing or mark it sold on every other site in the "Listed on" column.
- Pull the item from its bin and set it aside for packing or pickup.
For local sales on Facebook Marketplace, OfferUp or Craigslist, mark an item Pending on your list as soon as you agree to meet, and don't promise it to a second buyer. If the meetup falls through, switch it back to Active. Our guide on how to delist sold items across marketplaces covers the takedown step for each site.
5. Do a weekly sweep
Once a week, sort your list by listed date and look at anything that's been up a long time.
- Lower the price or refresh the photos on items with views but no sale. See how to price used items to sell.
- Add another marketplace for items that have only been listed in one place.
- Spot-check two or three bins to make sure what's on the shelf matches the list.
Ten minutes a week keeps the list honest, and an honest list is what makes selling on several sites safe.
Common mistakes
- Two lists (one on your phone, one on the computer) that don't match
- Listing an item before it has a code and a bin
- Forgetting a local-only listing when something sells online
- Mixing personal stuff into resale bins
- Waiting until the end of the day to mark sales
Where ListBomb fits
ListBomb helps you write one listing from your photos and get it onto several marketplaces. It posts to eBay through eBay's official API and to the free ListBomb Marketplace. For Facebook Marketplace, OfferUp, Craigslist, Mercari and Poshmark, it copies your listing text so you can paste it and tap Post yourself, so add those sites to the "Listed on" column as you post.
Free covers 2 items at a time, and Basic is $9.99/mo and Pro is $19.99/mo (yearly saves 10%). For the listing itself, see how to crosslist items and how to write listing titles and descriptions that sell.
The short version: one code per item, one bin per code, one list for everything.
FAQ
What is the easiest way to organize resale inventory?
Give every item a short code, write that code on a tag or bag, store items in numbered bins, and keep one list that shows the code, the bin, the price and every site it is listed on. When something sells, you find it by its bin number and mark it sold everywhere from that one list.
What should an inventory code or SKU look like?
Keep it short and readable, for example the bin number plus a running number, like B04-017 for the 17th item in bin 4. eBay sellers can enter a code like this in the Custom label (SKU) field, which eBay community mentors say holds up to 50 characters, so the code shows up next to the sale.
How do I avoid selling the same item twice on different marketplaces?
Mark the item sold on your master list the moment a sale comes in, then remove or mark it sold on every other site right away. Check that list before you accept a local pickup, and avoid holding an item for a buyer on one site while it is still live on another.
Do I need special software to track inventory?
No. A spreadsheet or notes app works for most part-time sellers. What matters is that there is only one list, it is updated every time you list or sell, and every item on a shelf has a code that matches a row.
Does ListBomb keep track of where an item is listed?
ListBomb helps you create one listing from your photos and get it onto several marketplaces. It posts to eBay through eBay's official API and to the free ListBomb Marketplace; for Facebook Marketplace, OfferUp, Craigslist, Mercari and Poshmark it copies your listing text and you tap Post yourself, so you should still note those sites on your own list.