Traveling by Bus from La Paz to Copacabana

When booking a bus from la paz to copacabana, keep in mind that almost al agencies use the same bus. No need to spend more than the cheapest one, around 30 bolivianos wiill do. We paid a little more with AkaPacha, who promised us there would be a toilet/bano on board. This was just untrue and the bus was shared with several other agencies bookings. Dont trust everything they say.