Movie S4.

Inflation of a combined soft actuator–sudden increase in length. Inflation of a combined soft actuator consisting of two interconnected fluidic segments, characterized by (Lbraid,Ltube)=(48,30) and (50,20) mm. In the experiment, we inflated the segment with water at a rate of 20 mL/min. At v=26 ml an instability at constant volume is triggered, causing a sudden increase in length of 10 mm, which corresponds to an increase of 11%.