Which ISTA test do I need?
ISTA (International Safe Transit Association) procedures are standardized ways to simulate the abuse a package takes in transit — drops, vibration, and compression — so you can prove a pack survives before you ship it at scale. The problem when you search "which ISTA test do I need" is that the results are lab service pages that assume you already know your procedure. The right test depends mostly on two things: how your package ships and how much it weighs.
The common procedures, in plain language
- ISTA 1-series — basic non-simulation integrity tests; a screening step, not full transit simulation.
- ISTA 3A — general simulation for individual parcels of 70 kg (150 lb) or less shipped through a parcel carrier; the default "will it survive the parcel network" test.
- ISTA 3B — simulation for less-than-truckload (LTL) freight, with package types for standard packages up to and over 200 lb, cylinders, and palletized or skidded loads.
- ISTA 3E — unitized loads of similar products shipped by full truckload: the pallet is tested as one unit.
- ISTA 6-Amazon.com — Amazon’s procedures, including SIOC (ships in its own container, no over-box) and over-boxing. SIOC has eight test types: A, B and C for parcel delivery under 50 lb, 50 to under 100 lb and 100 lb or more; D and E for LTL under and over 100 lb; F for palletized LTL; G and H for TVs and monitors.
Let the channel choose the test
A single parcel of 150 lb or less through UPS or FedEx points to 3A. Selling on Amazon as ships-in-own-container points to ISTA 6-Amazon SIOC — the strictest common e-commerce test, because your retail box is the shipper. LTL freight, palletized or not, points to 3B; a full truckload of unitized pallets points to 3E. The selector above maps your channel and weight to the usual procedure, but the final say belongs to your carrier or retailer’s published requirement and to the ISTA standard itself.
Questions
What is ISTA 3A testing?
ISTA 3A is a general simulation test for individually shipped parcels moving through a small-parcel carrier. It subjects the package to a sequence of drops by orientation, random vibration, and compression that approximates the parcel-delivery environment. Passing 3A is the common way to show a single package survives the UPS/FedEx-style network.
Which ISTA test do I need for Amazon?
If your item ships in its own container with no over-box, you generally need ISTA 6-Amazon.com SIOC, the strictest common e-commerce test because the retail pack is the shipper; the test type (A to H) follows the weight, parcel or LTL delivery, and whether it is a TV or monitor. If Amazon over-boxes the item for delivery, the over-boxing procedure applies. Amazon no longer preps FBA units: its US prep and poly-bagging services ended on 1 January 2026, so you prep the unit before it ships in. Confirm against Amazon’s current vendor requirements.
What is the difference between ISTA 3A and 6-Amazon?
ISTA 3A is a general parcel-simulation test for any small-carrier shipment. ISTA 6-Amazon.com is Amazon’s own series tuned to its fulfillment network, including a strict SIOC procedure for items that ship in their own container. Selling on Amazon SIOC typically requires 6-Amazon rather than 3A.
Do I need ISTA testing to ship?
It is not a universal legal requirement, but many retailers and marketplaces — Amazon in particular — mandate a specific ISTA procedure before you can list or ship at volume, and passing one is strong evidence your pack survives transit. Even when not required, it is cheap insurance against damage claims. Check your channel’s vendor guide.
What does an ISTA test actually do to my package?
It runs your packaged product through a repeatable sequence of distribution hazards — drops at set heights and orientations, random vibration on a shaker table, and compression to simulate stacking — then you inspect for damage. The specific sequence and severity depend on the procedure, which is why choosing the right one for your channel matters.
Testing the pack? Label it too.
PackOS doesn’t design or sell shippers — for the box, the box compression calculator estimates stacking strength. PackOS Quick Quote prices custom roll labels today: if the product needs one, upload the artwork for an instant label quote.