Your customs form can only be so long and they won't take your CVS receipt at the border.
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For this reason, SKULabs automatically compresses your customs form when you have similar items. We will also automatically summarize at the Kit level whenever there are too many items.
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You can manually merge items and use kits as single-lines on your customs form using the "Merge kit items" and "Merge duplicates" buttons within the customs form.

By default, these two options are configured to take place automatically if there are more than 20 items in the shipment.
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Your carrier may have lower limits, if you need to adjust this limit, contact SKULabs support using the "request help with rates" process so we can get the exact carrier and shipping details we require in order to file these customization requests to streamline your shipping flow.