Storing acoustic guitars upright in case in Gibson Acoustic Posted December 17, 2019 · Report reply 1 hour ago, j45nick said: BuddyW, do you live in an exceptionally dry climate? The cracks you are seeing aren't really normal in a guitar that has been kept reasonably humidified over its life. I have several 70-year-old guitars that have rarely been kept in a controlled climate, and they show no signs of cracks, nor do any of my other guitars. What is the floor in the space where you store your guitars? Rooms with poorly-insulated outside walls in colder climates can be problematic when it comes to controlling humidity. Whenever possible, I would store guitars away from exterior walls, and certainly away from any source of heat, whether it is forced hot air or radiated. Make sure that black paint and carpet never come in direct contact with any of your guitars. If possible, post a photo of one your guitars showing the type of cracks you are seeing. Thanks J-45Nick I got to get busy today but will get back with you on the photographs.