For the exception of one or two airlines, most that we use allow their travelers to have one carry on item and one personal item with them in the main cabin free of charge.
Depending on the airline, your first checked bag will most likely come with a fee of about $25. Since the fees and allowances are constantly changing, we recommend that you check directly with the airline shortly before your set travel date for the most up to date information. Your E-Ticket also will likely have baggage details in the bottom section below your travel itinerary.
Please keep in mind that, if a fee is applicable, you will be required to pay this fee when you check in at the airport directly to the airline, not to S-Trip!