The Auertech portable washing machine is the largest one on our list, with twin tubs and a combined capacity of 28 pounds. It has a list price of $190 on Amazon, with 4.2 stars and over 1,200 ratings.

By investing in a twin-tub washing machine, such as LG’s new 15 kg and 18 kg models, you not only save time but also conserve water, energy, and money while gaining greater control over your ...

According to LG, rather than being a single product, the secondary washer can be purchased separately and integrated with any of the company's most recent front-loading machines.