https://storage.googleapis.com/rideshare-static/Rideshare_Payload_Users_Guide.pdf https://storage.googleapis.com/rideshare-static/Rideshare_Pa... Here is the gu

https://storage.googleapis.com/rideshare-static/Rideshare_Payload_Users_Guide.pdf https://storage.googleapis.com/rideshare-static/Rideshare_Pa... Here is the guide from SpaceX on the specific details. The biggest size for each smallsat is 24" x 24" x 24", but they also offer a smaller 15" size.