The Jacks Plastic Welding guitar bag is made to fit a Regular guitar with its original hardcase. We recommend light colors (White works best), that the guitar be placed in the bag with the neck down, and that you place a sleeping bag in with your guitar. The reasons for the sleeping bag are these: Condensation can hurt your guitar as much as getting it wet. Useing a sleeping bag will force you to open the bag once a day and let condensation escape. The sleeping bag acts as a dessicant, providing an absorption mass that will keep the environment in the bag dry. Put the Guitar case in upside down so that the closure had a broader surface area to close against.