Customs is relatively straight forward here, you will get forms in English from the airlines. Don’t bring things in new boxes as that tends to make them think you are reselling it. If it looks like your regular gear you will be fine, they are used to fishermen. If it looks like you are trying to stock a new Walmart you’ll get an interview. We’ll give you more specific instructions shortly before your trip if you ask.
PLEASE NOTE: You are kindly advised to have a passport valid for at least 6 months as from the date of your arrival to Panama. If this is less, there is a very high chance they won’t let you into the country.