A quick reference guide from Amazon Seller Central, this resource from Seller Central covers the following:
Labeling Inventory
Shipment Labels
Packaging and Prep Requirements
Shipping Requirements
Shipment Packing Guidelines
Small Parcel Delivery (SPD) to Amazon
Less than Truckload (LTL) Deliveries to Amazon
Label Font Specifications
Packaging Specifications for Various Types of Inventory Items
How to Label Products