A slab that survived grading intact can still crack in shipping if it's packaged carelessly. Carriers don't handle boxes gently, and a graded card case is more fragile than most sellers assume once it's out of your hands.
The good news is that safe shipping doesn't require anything exotic, just a consistent process and the right combination of inner and outer protection.
This guide covers the actual packaging steps that prevent the most common shipping damage: cracked slab cases and bent envelopes.
Even inside its graded case, a slab should go into a resealable bag first. This keeps moisture out and adds a layer of separation between the slab and whatever cushioning surrounds it.
A team bag works well here, it's sized for cards and slabs and reseals cleanly, unlike a generic sandwich bag that can tear or fail to reseal properly.
Packages get dropped, thrown, and stacked, so cushioning needs to protect against pressure from every side, not just the top. Cardboard reinforcement between the slab and the outer envelope prevents the case from flexing under pressure.
Skipping rigid cardboard support and relying on bubble wrap alone is a common mistake, bubble wrap absorbs shock but doesn't prevent a slab from flexing if the envelope itself gets bent.
A proper poly bubble mailer combines a padded interior with a tear-resistant exterior, which standard paper envelopes and generic bubble mailers don't reliably match. This is especially important for higher-value slabs where the cost of a mailer is trivial next to the card's value.
Size the mailer appropriately, too large and the slab shifts around inside during transit, too small and you can't fit adequate cushioning around it.
When shipping several slabs together, avoid letting them stack directly against each other, even with individual bagging, since the hard plastic cases can still transfer impact between one another under pressure. Separate each slab with cardboard or foam so they're cushioned independently rather than relying on each other for support.
Labeling each slab's position within the package, or using a printed packing slip, also helps if a buyer needs to confirm everything arrived as described, and it reduces confusion during unboxing for multi-card shipments.
Photograph the packaging and the damage immediately upon opening, before removing anything further, since most carriers and marketplaces require photo evidence of both the exterior packaging and the item itself for a damage claim. Keep the original box and all packing materials until any claim is fully resolved.
Grading companies generally won't regrade a card damaged after the fact due to shipping, so the claim process runs through the carrier or the marketplace's buyer protection, not the grading company itself.
International shipments face longer transit times and more handling touchpoints, which increases the case for extra cushioning even beyond what a domestic shipment might need. Customs handling in particular can be rougher on packages than standard carrier processing.
Factor in slightly more padding and a sturdier outer envelope for any cross-border shipment, the added cost is minor compared to the risk of a slab arriving damaged after weeks in transit through multiple handling systems.
Carrier handling practices vary, and it's worth using a service with tracking and, for higher-value shipments, signature confirmation and declared value coverage. The extra cost is small relative to the protection it provides if a package is lost or damaged in transit.
Keeping a small stock of team bags, cardboard, and mailers on hand before you need them means you're never rushing a shipment with whatever's available. This is a small habit that consistently pays off for anyone selling or trading cards regularly.
No, bubble wrap alone doesn't prevent the envelope from bending, which can crack a slab case even with cushioning.
Yes, a resealable bag adds moisture protection and a layer of separation from the surrounding cushioning material.
Envelope flexing under pressure without rigid cardboard support behind the slab.
Yes, an oversized mailer lets the slab shift and impact its edges during transit.
Good packaging costs a few dollars and takes a few extra minutes, and it's the difference between a slab arriving in the same condition it left in and a damaged-case dispute. Build the same process into every shipment rather than improvising each time.
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