We recommend the BikeFlights Bike Box Large for shipping e-bikes. It’s sturdy, reusable and recyclable and was designed specifically for packing e-bikes and other larger or heavier bikes.
You may also ship your e-bike in most standard hard and soft cases. Just make sure your container is sufficiently sturdy to withstand shipping an e-bike which is often heavier than a standard bike.
See also “How do I pack my e-bike for shipping?”