Use a large syl bag, put your dirty clothes, some bio degradeable soap, seal the bag, and agitate for 5 mins. Dump the wash water, rinse and your done. Best system I've ever used. No large bulk containers to worry about. Simple to use and you use the syl bag for other uses as well.
A quick google of 'syl bag' shows designer handbags. Since I'm pretty sure that's not what you mean, would you please elaborate?
I think you'll find that the reference is to a silicone/nylon 'sil' bag, AKA a dry bag.
Smooth roads....? Hmmm, not sure where you visited but it certainly wasn't the Highlands. :Wow1: