Alright, that does make sense.
Huh, itās really that easy? I can do that. Right now, even. I think I have one of those dry cleaning bags, and I should find a sponge easily. Thank you so much for this! 
Have to think about the humidifier for the room, or packs for the guitar case, but first, itās off to the plastic bag for my baby^^
Youāll notice that crack closing up as the guitar absorbs moisture. Keep us in the loop on how things are working, you donāt want to keep it in the bag to long but it could take months to get enough moisture back into it.
Will do. How do I know when itās enough? When the crack is closed,or are there other indicators? How did yāall know it needed moisture at a glance?
The inside of your guitar is unfinished wood and will absorb moisture faster than the outside which has a finish on it. So when the inside start to look like its no longer dry you can start keeping it out of the bag for longer periods of time(playing it 
). You should notice it will play easier and sound better. If it starts to sound like itās stuffed with a tāshirt itās to moist and can stay out of the bag it is finished.
By monitoring the Relative Humidity in the room you keep you guitar in you will know when to humidify it and when it doesnāt need it.
I live in southern Alberta new the Rocky Mountains and have a whole house humidifier and keep it around 40% RH in the winter. If you live in a really dry area it may be best to put it in itās case with the humidipak to help keep it humidified.
If you have no problem keeping your home above 35-40% RH in the winter then you can keep it on a stand or wall hanger.
I keep mine out all year round, my wife puts Santa hats on them at Christmas time. Iāll see if I can find the pictures and post one
Thank you so much, it does sound different, even after just a few hours. Fuller, somehow, richer.
(I couldnāt help myself and had to play the first part of Greensleeves again, since I learned it just today. Now my guitar has lost its moisture again, and I know the second part as well^^. Itās gonna sleep in the bag now, though, unless Iām practicing.)
First, thank you @sairfingers for the recommendation.
@sevi, I have seen and repaired those sorts of cracks many, many times. You are getting very good advice from the other members, especially regarding hydration. Guitars in storage for a long time without an adequate humidity control almost always develop this problem. You are not alone.
Regarding the crack repair, you should definitely work on it. A crack in dry wood will grow. Itās under tension and the simple act of picking it up will tend to help it grow a bit. You also have two cracks. I noticed a second crack, a small one, about a cm below the left end of the big one. Itās at the left edge of the photo, so I canāt tell how far it extends, but itās best to take care of both at the same time. So, time to glue it up. Your Titebond room-temp hide glue is one of the two best for this. I use it often.
If you wish I can post a step-by-step instruction of how to go about it. It is not at all difficult, but there is a procedure and there are some cautions and tips about how to do certain parts of it.
Couple of things you must realize; the main crack is large and deep, and the edges (top and bottom) have oxidized, so although it can be fixed, the crack path will still be visible (wonāt look like new). The other is that the wood wonāt change position when you humidify it, it will simply swell from the added moisture. So, before you put it in your baggie, put a hand inside the body and finger press the crack edges together, so thereās no big misalignment step edges. Using hands and fingers is good (you can feel things), just be sure to press or squeeze, not jerk or jam.
Want the step-by-step, give a shout. Will help all I can.
Iām glad I saw this before I went to bed, and did as you recommended. I loosened the strings, and it was surprisingly easy to align the sides, not much pressure needed at all. Now it will swell in the right position, and it should make it easier to glue, yes?
I have found a few tutorials on how to glue cracks like this, but I wouldnāt mind some tipps, since they have different opinions on some things. I have also looked for the second crack, but couldnāt find it. Iāll examine it more tomorrow in daylight.
Thank you so much for the already very good advice
Edit: I have no problem with my guitar looking used, itās scratched all over already, and belonged to one of my uncles in the 60s, if my mum is to be believed^^
It starts just beneath the left hand end of the first crack, going further left. Itās mostly visible in your second picture when you enlarge it.
Yes, youāre right, I found it in the picture, will find it on the guitar now, too.
Hi @sevi. Since you found some tutorials, you now have a good idea about whatās involved. Many ways to do this. You can apply glue from the outside or inside (or both). I like to go from the outside because itās easier to see what Iām doing. Clean up with a hot damp rag is easier too.
What you will need.
A nice bottle of Pils or Berliner Weisse. Drink the beer but save the bottle cap. You want the cap.
A smooth soft cloth (old t-shirt is great). A bowl of hot water, at least 38C (100F). Get the rag hot and damp, it shouldnāt be dripping, to clean up the glue smears. Maybe some painters tape to mask the crack on the inside.
Gravity helps, so stand to guitar on its side with the crack facing up. Ok, put about 0.5ml glue in the bottle cap, add 1 drop of water (a drop off of the finger). Stir it around, get a schmear on your finger and lightly rub it along the crack (work it into the crack). Get more schmears and keep working it in till you have gone the whole length of the crack. I like to start at the widest (most open) part and work towards the ends. Then return to the wide part and do another pass. Clean up the glue mess with the hot damp cloth. You can clamp it now, but I like to wait about five minutes. Sometimes very dry wood will absorb enough moisture to leave a teeny bit more room for a final pass. Optional.
Clamp it gently until you see a bit of glue squeezing out. Thatās sufficient pressure, donāt stress the joint. Wipe off the squeeze out. Have another Pils.
Keep clamped for 4 hours minimum. Technically, the specs say 2, but that makes me nervous. I do 24 hours because then the bond is āperfektā and I donāt have to worry.
You will do fine and your guitar will love you even more for it.
Good luck, Eva
Iām with Jamolay here. Take it to a good luthier. See what they can do. If you make a repair and its not the right glue/ procedure it may do more damage. If you have to wait due to finances or distance to a Luther I 2ould wait and keep your guitar humidifier.
I had let my baby soak up moisture for the last few days because I did not have the time to do the repair. Now I have done it exactly like you said - I do hope the beer part was optional, though, since Iām more of a wine person 
- and now Iām waiting 24 hours for it to bond.
The small crack has vanished completely,from sight and feel both, and the big one looks ok and feels ok-ish, not completely smooth, more like both sides are sitting on top of each other but donāt fit smoothly anymore because theyāve been apart for too long. I think thatās ok, I need them to not crack any further, not look pretty. Iāll be posting pictures tomorrow, if you like.
@sevi, Congratulations Eva. You bonded a troublesome crack and bonded closer with your baby. That was a project that many would not undertake by themselves. You came through with flying colors. Iām proud of you and glad I may have helped, some.
Slightly mismatched edges are normal and expected under the circumstances. There are specialty tools and clamps that minimize that sort of thing, but most folks donāt have them in the kitchen drawer. Not to worry. You met the objective.
Pictures ! Yes, would like to see.
Thank you for the flowers, as we say in Germany 
Iām already playing again, even though it hasnāt been exactly 24 hours, but I figured itās close enough^^ Of course my strings donāt really want to stay in tune after being loose for so long, but thatās a minor irritation and bound to go away after they adjust to being under pressure again.
Pictures, of course, or it didnāt happen
)
That looks a lot better. Good job. Howās the re-humidifing coming? Where the top and side join looks better as well.
Yep, aber selten. Here in Alabama we say ātires aināt prettyā. Meaning is the same.
Nice job. Time isnāt critical, so play away to your hearts content.
Ciao
John
Sheās still living in the bag for now, and Iām doing something similar for the trunk as well, but Iāve already put an open water container in the room to raise the humidity, and thinking about if I have stuff to make something like a small water fountain for the room to do more of it. I donāt have a thingy to measure how humid it is, but itās obviously too low since both wooden and unvarnished items have cracked.
Ohh, I like that one^^
Thank you all for helping me help my baby, we are both very grateful! 
IMO itās worth getting a hygrometer. They are not very expensive. Ideally, get one you can calibrate, and they do calibration kits.
One of the best places to get hygrometers is cigar retailers.
Cheers,
Keith
