Three  years  ago, I started using crypto containers for private data.
 Basically, I used this for mounting them:

   1   losetup /dev/loop0 "$IMG"
   2   cryptsetup luksOpen /dev/loop0 tresor
   3   mount /dev/mapper/tresor mount/

 Unmounting is done in a similar way:

   1   umount mount/
   2   cryptsetup luksClose tresor
   3   losetup -d /dev/loop0

 If you speak german, there's more verbose notes on that at [1].

 This works very well except for one thing: Your data is stored  in  an
 encrypted file of fixed size. So, from time to time, I had to increase
 that size from 50MB to 256MB to 1024MB...

 How about EncFS[2]?  Just tried it. It's simpler to  use  and  doesn't
 rely  on  files  with  fixed sizes. Looks good. I don't need "perfect"
 security so I don't care about  the  fact  that  people  can  see  the
 directory structure or the number of files (they can't see file names,
 of course).

 Why am I using encryption in the first place? I  want  to  protect  my
 data  if  my laptop gets stolen. That's it. Most probably, the average
 thief is not able to crack an EncFS. I bet he'd simply sell the laptop
 or wipe the hard drive so he can install Windows...

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 1. gopher://uninformativ.de/0/txt/gnu-linux-notes/CryptSetup.txt

 2. https://wiki.archlinux.org/index.php/EncFS

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