Greetings @Seller_N5MN2237qLQVO, and welcome to the forums! I will be happy to answer your questions.

Seller_N5MN2237qLQVO

is the dimension of product or the pack that contains product.

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Product dimensions and volume are measures of the product’s size when fully packaged and ready to ship in accordance with FBA policies and requirements.

Seller_N5MN2237qLQVO

also do I need to pack on other bag like poly bags.

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Follow these general requirements when shipping units to fulfillment centers. Certain products have other specific requirements. Amazon may refuse, return, or repackage any product delivered to a fulfillment center with inadequate or non-compliant packaging at your expense. Amazon may add specific requirements to a product due to damages and damage-related returns.

• Any FNSKU you use on a unit must be unique and must correspond to one unique product. For example, each assortment type, such as size or color, must have a different FNSKU.
• Each unit must have an exterior scannable barcode or label (which includes a scannable barcode and the corresponding human-readable numbers) that is easily accessible.
• Remove, cover, or render unscannable any existing scannable barcodes on the outside of shipping boxes. For example, cover existing barcodes with opaque tape or use a black felt-tip marker to render the barcode unscannable. This prevents the incorrect barcode from being accidentally scanned during the receiving process.

I recommend checking out this thread I created last year on Packaging and Prep as it contains additional information and resources related to this topic!

- Bryce