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The Holga 120-S, being a toy camera constructed of thin plastic, is absolutely notorious for light leaks. While many photographers like the effect that light leakage has on Holga photographs, others, myself included, attempt to minimize light leaks. Here are some practical suggestions.
TAPE
After loading the Holga 120-S, it is a great idea to tape all seams where two pieces of plastic come together on the exterior of the camera with black tape. Some people use photographer's tape, I personally have done well with electrician tape.
In taping my Holga, I make sure to cover the entire seam where the back of the camera meets the front and the seam on the front above the lens. I also tape a rectangular piece of cardboard cut from the film box over the red exposure counter window on the back cover in a manner that it can be peeled up when advancing the film and then stuck down again. Leaving the red window uncovered can cause the exposure number from the film backing paper to burn through onto your image.
Also, if you are shooting in 6x6 mode, with the 6x4.5 adaptor removed it is a good idea to tape over the two vertical slots you will find where the adaptor attaches to the camera body. Failing to do so can produce light leaks on the film to the right and left of the current frame when taking a picture.

FLOCKING
Another good idea to reduce the effect of light leaks on your images is to flock the inside of the camera. Simply put, this means spray-painting the interior of the camera with a flat black or matte finish paint. The matte finish reduces the effect of leaked light reflecting off of the shiny black paint inside the camera.
AVOIDING "FAT" ROLLS
The Holga 120-S is also notorious for inadequate tension on the take up spool, which will result in a loosely wound roll of exposed film, or a "fat" roll. Your exposed roll of film should be wound very tightly in order to prevent light leaking in from the edges prior to processing.
The most popular method of dealing with fat rolls is to tear a small piece of cardboard from the film box, fold it in half, and insert it beneath the take up spool when loading the camera. This will increase tension on the take up spool and will cause the film to be wound tightly on the spool.
Some have recommended placing a piece of cardboard beneath both spools, but I have found that this will produce too much tension which, in my experience, has resulted in making the film wind knob very difficult to turn to the point that I twisted the knob off of the camera. (Of course, that was easy to repair with Super-Glue as it is only glued on to begin with.)
For added insurance, I always unload my Holga 120-S in either a darkroom changing bag or in a totally darkened room. If I discover I have a fat roll, I can tighten it up on the spool by hand prior to sealing it. 
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