On my 3.5 month trip earlier this year, I was given a couple of products to use when hand-washing my clothes. Here are my thoughts on those offered by Sea to Summit.
Buy Sea to Summit Wilderness Wash 50ml
Sea to Summit Trek & Travel Pocket Laundry Wash
Wilderness Wash Pocket Soap
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Sea to Summit Wilderness Wash
Pocket Wilderness Wash - Biodegradable Soap
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Laundry on the Road: Essentials for Hand-washing - Her Packing List
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Description These Trek and Travel Pocket Soaps contain 50 leaves of pure, dry soap so there's no risk of leakage in your luggage or pack and no risk of having it confiscated by airport security. The easy-to-ration leaves mean you'll have plenty of soap to last your entire trip. Handy for travel or camping because they're lightweight and compact. They're also biodegradable so they won't harm the environment when used in accordance with Leave No Trace principles.
Sea to Summit Pocket Laundry Wash - 50 leaves
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Laundry on the Road: Essentials for Hand-washing - Her Packing List