Seller Growth
USPS Package Size Limits: Where 108 Inches Changes the Price
USPS package size limits turn on girth, not weight: 108 inches for Priority Mail, 130 for Ground Advantage, plus three size fees that stack before it.
Field Notes
Tips and guides for adding size annotations to your product images
B2B & Suppliers
Air Freight Maximum Dimensions: The 163 cm Ceiling
Air freight maximum dimensions are set by the ULD, not the aircraft: 163 cm in the belly, 244 cm on a freighter. The real ULD numbers, and what they cost you.
Seller Growth
How to Set MOQ: Stop Rounding, Start Counting Cartons
How to set MOQ without guessing: build the number up from the case pack, the pallet and the container, and always say which unit it is counted in.
Photography
360 Product Photography Requirements: 6 Expensive Myths
360 product photography requirements decoded: Amazon’s real frame counts, who is allowed to upload a spin, and the one buyer question a spin cannot answer.
Compliance
Bol.com Product Image Requirements: Whose Photo Wins
Bol.com product image requirements start at 500 × 500 px — but a content score decides whose photo appears. Full specs, rejection traps and 2026 changes.
B2B & Suppliers
A2-70 vs A4-80: What the Bolt Head Marking Really Says
A2-70 vs A4-80 packs two facts into one code: the steel grade and the property class. What ISO 3506-1:2020 requires, and what the head must show.
Size & Fit
Sink Base Cabinet Size: Why a 33-Inch Sink Needs 36
Sink base cabinet size is not the sink size: a 33-inch sink needs a 36-inch base. The cabinet, cutout and apron numbers to lock before you quote.
B2B & Suppliers
Foam Density vs ILD: Why 30 Density Is Not Firmness
Foam density vs ILD are two different specs: density is kg/m3 durability, ILD is pounds of firmness. The four-line foam spec that stops cushion disputes.
B2B & Suppliers
Packing List vs Commercial Invoice: Which Numbers Go Where
Packing list vs commercial invoice: the two documents share five numbers, and customs, the carrier and the buyer each reject the shipment over a different one.
Size & Fit
Comfort Height Vanity vs Standard: 34 Inches Is the Limit
Comfort height vanity or standard height? 32, 34 and 36 inches each serve a different buyer, and only one of them clears the ADA lavatory maximum.
Conversion
Size in the Product Title: What 75 Characters Changed
Size in the product title now competes for 75 characters on Amazon. What to keep, what moves to item highlights, and where the dimensions belong.
Seller Growth
Hotel FF&E Specification Requirements: The 9-Document Packet
Hotel FF&E specification requirements, document by document: the nine files a hospitality buyer needs before your factory gets on the bid list.