Yes, you can consolidate (combine) several packages into a single shipment. The number of items you can consolidate depends on the product classification and the quantity allowed per type, not on the number of packages. Remember that the total merchandise value must not exceed $1,000 USD.
It's important to note that when consolidating, the original shipping boxes (not the product packaging) are discarded in order to place all items into a new single box. This means that the shipping cost will be based on the weight and dimensions of the new box, not the original ones. Additionally, any applicable taxes will be calculated based on the total value of all the products included in the consolidated shipment. Please keep this in mind when deciding to consolidate your purchases.