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Shipping Basics for New Sellers

April 2026 Β· 6 min read

Shipping is the part of online selling that intimidates most beginners β€” but it's actually straightforward once you know the basics. This guide covers everything you need to know to ship your first item with confidence.

Free Shipping vs Buyer-Paid Shipping

This is the first decision every seller faces. Both approaches have trade-offs:

Free Shipping

  • Buyers love it β€” increases conversion
  • Many buyers filter or sort for it
  • You absorb the shipping cost (build it into the price)
  • Most platforms still charge fees on the higher item price

Buyer-Paid Shipping

  • Lower listed price looks more competitive
  • You don't eat the cost if shipping is expensive
  • Some buyers filter for "Free Shipping" and won't see your listing
  • Most platforms charge fees on shipping too

Bottom line: For items under $30, buyer-paid shipping usually makes more sense. For items over $50, offering free shipping (with the cost built into the price) tends to result in faster sales.

USPS, UPS, and FedEx β€” Which to Use

For most resellers, USPS is the go-to carrier. Here's why:

  • USPS Ground Advantage: The cheapest option for lightweight items like clothing, accessories, and small electronics, with tracking and 2–5 business day delivery. It replaced First-Class Package Service in July 2023.
  • USPS Priority Mail (up to 70 lbs): 2–3 day delivery, with tracking and up to $100 insurance included. Costs more than Ground Advantage.
  • UPS Ground / FedEx Ground: Better for heavy items (over 5 lbs). Often cheaper than USPS for bulky packages. eBay offers discounted UPS/FedEx rates.

Pro tip: Services like Pirate Ship offer the cheapest USPS and UPS rates available β€” often cheaper than buying postage directly at the post office. It's free to use.

How to Weigh and Measure Packages

Accurate measurements prevent shipping corrections and overcharges:

  • Get a postal scale: A basic digital scale ($10–$15 online) pays for itself quickly. Kitchen scales work for lightweight items.
  • Weigh the packed item: Include the box, tissue paper, poly mailer β€” everything. The carrier charges on total package weight, not just the item.
  • Measure dimensions: For UPS/FedEx, dimensional weight (L x W x H Γ· 139) can be higher than actual weight β€” and the carrier charges whichever is greater.
  • Round up: Buy the label for the next weight step above what your scale shows β€” a 15.3 oz package needs the up-to-16 oz label, not a 15 oz one. Getting hit with a shipping adjustment is more expensive than rounding up.

Platform Shipping Labels vs Self-Shipping

Most platforms offer their own prepaid shipping labels:

  • Poshmark: One flat-rate USPS Ground Advantage label for packages up to 5 lbs, paid by the buyer
  • Mercari: Prepaid labels priced by weight and carrier β€” the buyer pays, or it comes out of your payout if you offer free shipping
  • eBay: Discounted labels through the seller hub (USPS, UPS, FedEx)
  • Depop: Integrated USPS shipping labels
  • StockX / GOAT: Prepaid labels provided after sale

Platform labels are almost always the easiest option β€” tracking is automatically linked to your order, and the buyer can see real-time updates. Self-shipping (buying your own postage) makes sense when you can get a better rate through Pirate Ship or have a UPS/FedEx business account.

Packaging Tips

  • Poly mailers: Perfect for clothing, soft goods, and lightweight items. Cheap (about $0.10–$0.50 each, depending on size and quantity), lightweight, and water-resistant.
  • Boxes: Required for fragile items, shoes, electronics, and anything that needs structure. Save Amazon boxes and reuse them β€” just remove old labels.
  • Bubble wrap: Use for fragile items. Wrap individually and fill empty space so items don't shift during transit.
  • Tissue paper: A nice touch that improves the unboxing experience. Doesn't add weight but makes a good impression.
  • Thank-you cards: Optional but effective β€” a handwritten note can lead to positive reviews and repeat customers.

Where to buy supplies cheap: Dollar Tree, Amazon bulk packs, or free USPS Priority Mail boxes (order at usps.com β€” they ship to your door for free) β€” but only for packages you send by Priority Mail.

Common Shipping Mistakes

  • Underestimating weight: Mercari charges an 8% shipping correction fee if the actual weight exceeds what you selected. Always weigh the packed item.
  • Shipping late: Most platforms expect you to ship within 3 business days. Late shipments hurt your seller metrics and can lead to cancellations.
  • Poor packaging: Items damaged in transit result in returns, refunds, and bad reviews. Take 30 extra seconds to package properly.
  • Forgetting that fees apply to shipping: On eBay, Mercari, and Etsy, the marketplace fee is calculated on the total order amount β€” item price plus shipping. Charging $5 + $8 shipping costs you the same in fees as charging $13 with free shipping β€” moving the price into shipping doesn't dodge the fee.

How Shipping Costs Affect Your Fees

Most sellers don't realize this: shipping increases your fees on most platforms because fees are calculated on the total order value.

Example: $40.00 item + $8.00 shipping on eBay (13.6% fee)

Fee on $48.00 total: $6.53

Fee on $40.00 item only (if fees excluded shipping): $5.44

Extra fees from shipping: $1.09

Use the FeePilot calculator to see exactly how shipping cost affects your payout on every platform.

Calculate Your True Cost

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