How to ship a package: complete guide for 2026

Shipping a package looks simple from the outside and gets confusing fast when you actually try it. Three carriers (USPS, UPS, FedEx) plus international (DHL) each split into four or five service tiers, weight tiers, dimensional weight surcharges, residential surcharges, fuel surcharges, optional signatures, insurance tiers, and the question of whether you should use a free Flat Rate box or your own packaging.

This guide walks through the whole process in order. By the end you'll know how to ship any package without overpaying and without the carrier rejecting your label at the dropoff counter.

Step 1: Pack the parcel

Carriers price by both weight and volume (dimensional weight). Packaging affects both, so it's the first lever for keeping costs down before you even start quoting.

Pick the right box size

Pack to the smallest box that fits your contents with a thumb-width of cushioning around the item. Oversized boxes cost real money - a 12 × 10 × 8 inch box charges 6.9 lb of dimensional weight even if the actual contents are 1 lb.

Use carrier-supplied boxes when they fit

USPS Priority Mail Flat Rate boxes (Small, Medium, Large) ship anything up to 70 lb for a fixed price regardless of distance. For heavy small items - books, hardware, ceramics - they regularly beat the weight-based Ground Advantage rate. USPS Regional Rate boxes are similar but zone-priced, often cheapest of all for 5-20 lb parcels heading short distances.

UPS and FedEx don't have an equivalent "any weight, one price" product; their pricing always scales with weight + zone.

Cushion fragile items

Carriers handle parcels rough. Anything fragile needs at least two inches of cushioning on every side - bubble wrap, foam, crumpled paper. The cost of insurance is irrelevant if the item arrives in pieces; the cost of a refund-and-reship is always more than the cost of an extra sheet of bubble wrap.

Step 2: Weigh and measure

Carrier rates are a function of four things: origin ZIP, destination ZIP, weight, and dimensions. Get any of them wrong and the rate you quoted won't match the rate you actually pay.

1. 1

   Weigh the sealed package

   Use a postal scale or kitchen scale that handles up to 25 lb (more if you ship heavy). Round up to the next whole ounce - carriers always round up at billing.
2. 2

   Measure length, width, and height

   In inches, to the nearest 0.5 inch. Length is the longest side. Carriers measure with the package sealed and any bulges included.
3. 3

   Calculate dimensional weight (if box is large)

   For parcels over ~1 cubic foot: length × width × height ÷ 139 (UPS, FedEx domestic) or ÷ 166 (USPS, all international). Compare against actual weight; whichever is larger is what gets billed.

If your actual weight equals dim weight, packaging is right sized. If dim weight is 2× actual, your box is too big - cutting it down can save $3-8 per parcel.

Step 3: Pick the carrier and service

This is the step where most shippers overpay. There's no single "best" carrier - the right pick changes per shipment based on weight, distance, and how fast it needs to arrive. The honest workflow is to quote every shipment side-by-side.

Cheapest carrier by weight bracket

General rules of thumb (your actual quote may vary):

• Under 1 lb: USPS Ground Advantage almost always wins. UPS and FedEx Ground rates climb steeply below 5 lb.
• 1-5 lb: Still USPS - Ground Advantage or Priority Mail depending on speed needs.
• 5-10 lb: Tossup. Quote both USPS and UPS/FedEx Ground; winner flips by zone.
• 10-50 lb: UPS Ground or FedEx Ground almost always win. USPS Priority Mail loses pricing competitiveness above 10 lb.
• 50-150 lb: UPS Ground or FedEx Ground only - USPS caps at 70 lb.
• Over 150 lb: Out of standard parcel range - you need LTL freight.

Pick a service tier based on the deadline

• 2-5 day delivery is fine: USPS Ground Advantage or UPS/FedEx Ground.
• 2-3 day delivery, with insurance bundled: USPS Priority Mail ($100 insurance included).
• Guaranteed 2-3 day: UPS 3 Day Select / 2nd Day Air or FedEx Express Saver / 2Day.
• Overnight: UPS Next Day Air, FedEx Priority Overnight, or USPS Priority Mail Express (Sunday delivery included).

The shiponline.app calculator quotes all four carriers side-by-side in 10 seconds. The ranked-cheapest list it returns is the answer for that specific shipment.

Step 4: Print the label

Three ways to print a label, in increasing order of how much you'll pay:

• Through shiponline.app or similar platform: commercial-tier rates passed through to you with a flat per-label fee. Cheapest for any meaningful volume.
• Direct on carrier websites: retail rates, which are typically 10-30% higher than commercial. Fine for occasional shipping; expensive at volume.
• At a USPS / UPS / FedEx counter: retail rates plus the staff time + line. Last-resort option.

Whichever path you pick, the label prints as a PDF you tape to the parcel. Use clear packing tape over the entire label so the barcode survives rain and handling.

Step 5: Drop off or schedule a pickup

Three drop-off options depending on the carrier:

• USPS: any blue collection box (small parcels), USPS post office, or schedule a free carrier-route pickup the next business day at usps.com.
• UPS:any UPS Store, UPS dropbox, or schedule a $5+ pickup. Drivers also accept handoffs at residential stops if they're already on the route.
• FedEx: any FedEx Office, FedEx Drop Box, or scheduled pickup ($5+).

For repeat shipping, schedule a recurring daily pickup - spending 5 minutes setting it up once saves an hour a week of dropoff trips.

The four mistakes that cost first-time shippers the most

1. Using one carrier for every shipment

The cheapest carrier swings with weight and zone. Locking into one brand for everything leaves $1-5 per parcel on the table. Quote every shipment.

2. Skipping dimensional weight math

Big light parcels (a 1 lb item in a 12 × 10 × 8 box) get billed at 6.9 lb. Knowing this lets you fix packaging before the carrier surprises you with a $5+ DIM-weight surcharge.

3. Paying retail rates direct on carrier websites

Commercial-tier rates are 10-30% cheaper than the retail rates usps.com / ups.com / fedex.com show by default. Third-party platforms pool volume to qualify everyone for commercial pricing without a contract.

4. Skipping insurance on items over $100

Carriers' baseline liability is $0-100 depending on service. For anything worth more than that, the $1-3 insurance charge is cheap protection. USPS Priority Mail bundles $100; everything else is a separate add-on.