Bag technique for washing clothes while backpacking?

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After googling, "wash clothes in a bag" I discovered that there are actually special washboard bags that you can buy specifically for washing clothes while you're backpacking/traveling (see the Scrubba below).

They provide instructions on their website on how to use the bag, but Im pretty confident that you could get similar results with any watertight roll-top bag using these modified instructions:

Put your clothes, water and soap into the bag (fill 20-40% of the volume of the bag).
Get as much of the air out of the bag as you can (saturate your clothes and work out any air that might be trapped in material-getting as much air out as possible really helps you out in the next step) and then roll the top 4-5 times and clip it.
Rub your clothes together inside the bag for a couple minutes - for better results you could pack a small silicone washboard, something like an anti-skidding silicone washboard for the shower might even work.
Pour out the soapy water and replace with clean rinse water. Rinse (shake the bag).
Wring out as much water as you can, if you have a towel you can press your clothes in it to draw out extra moisture, then hang them to dry while you sleep.

The Scrubba:

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