Insights from the SKU frontier. Real stories, proven strategies, and hard-won lessons from multi-3PL operations.
A case of candles shows up at your 3PL. The manufacturer's UPC is printed on the carton. Your private-label EAN is on the unit sticker. The Amazon listing for the same candle is keyed to an ASIN.
Location A shows 100 units. Your 3PL updates it to 50. Shopify still shows 100. Check Location B. Now it shows 50 units. But your 3PL doesn't even ship from Location B. The update "succeeded.
Your 3PL says onboarding takes 2-3 weeks. It takes 6-8. The difference? SKU mapping. Here's what actually happens when you try to get your product catalog into a 3PL's warehouse management system.
You're selling on Shopify, Amazon, and Walmart. You use ShipBob for East Coast fulfillment and a regional 3PL for West Coast. Each system calls your products something different.
You sell on Shopify and Amazon. Your 3PL uses ShipHero. When an Amazon FBM (Fulfilled by Merchant) order comes in, you might notice your products are set up as "kits." These aren't real kits.
You're setting up your first 3PL integration with Shopify. Simple question: where do you put their SKUs? Your product BLUE-HOODIE-XL needs to map to ShipBob's BLUE-HOODIE-XL (easy) and Amazon's...
ShipBob's Shopify app is actually pretty good. Clean interface, decent inventory sync, reliable order routing. For a single 3PL setup with under 100 SKUs, it's honestly one of the better integrations...
You're selling the same product on Amazon FBA and your Shopify store. Simple, right? Wrong. Your black coffee mug is BLACK-MUG-001 in Shopify, but Amazon's system generated X00-ABC-1234 when you...
You log into your dashboard. Your internal system shows 500 units of Product X. 3PL Partner A reports 487 units. Partner B shows 503. Your Shopify store thinks you have 495.
Managing SKU mappings across multiple 3PL partners can feel like herding cats. One small mistake and you're dealing with misrouted inventory, delayed shipments, and frustrated customers.