In addition to your suitcase, we highly recommend bringing a small backpack where to store things we may want to have on hand while we are riding the bike or hiking. The suitcase can not be rigid because there may be space problems to store it in the truck compartments.
The airlines that fly to Zanzibar charge fees for the excess of luggage. There’s a 15Kg limit. For bike routes, it is best to bring technical clothing (jersey and culote), for greater perspiration and avoid chafing.
In addition, it is very important not to forget to put soap into the toilet kit, as well as high-protection-grade sunscreen. The sun of the equator is stronger than the one we are accustomed to.