TASK DEFINITION: Translate the given Spanish text to English
PROBLEM: The device is modular and stackable.

SOLUTION: El dispositivo es ensamblable y apilable.

PROBLEM: The pump is operable to inflate the inflatable bladder.

SOLUTION: La bomba se opera para inflar la vejiga inflable.

PROBLEM: A continuous handle extends along the length of the first rail and is pivotally connected to the first rail between a lowered first position and a second raised position.

SOLUTION:
Una manija continua se extiende a lo largo de la longitud del primer riel y está conectada de forma giratoria al primer riel entre una primera posición reducida y una segunda posición elevada.