An article (10, 110, 210, 310) comprising: a cushioning assembly comprising: a first bladder element forming a first fluid chamber; a second bladder element within the first bladder element and forming a second fluid chamber sealed from and within the first fluid chamber; wherein the first bladder element comprises an inner surface having a first feature; wherein the second bladder element comprises an outer surface having a second feature; wherein the first feature interfits with the second feature such that a first area of the inner surface of the first bladder element is aligned with a first area of the outer surface of the second bladder element at a bonded interface; and wherein the second bladder element is exposed to the first fluid chamber away from the bonded interface; wherein the second bladder element comprises a deployable portion that protrudes inward when the second fluid chamber is at ambient pressure and deploys laterally outward into contact with a side portion of the inner surface of the first bladder element under pressurization of the second bladder element; and wherein the bonded interface is at the side portion of the inner surface of the first bladder element via the deployable portion and at opposing portions of the inner surface of the first bladder element adjacent the side portion. a cushioning assembly comprising: a first bladder element forming a first fluid chamber; a second bladder element within the first bladder element and forming a second fluid chamber sealed from and within the first fluid chamber; wherein the first bladder element comprises an inner surface having a first feature; wherein the second bladder element comprises an outer surface having a second feature; wherein the first feature interfits with the second feature such that a first area of the inner surface of the first bladder element is aligned with a first area of the outer surface of the second bladder element at a bonded interface; and wherein the second bladder element is exposed to the first fluid chamber away from the bonded interface; wherein the second bladder element comprises a deployable portion that protrudes inward when the second fluid chamber is at ambient pressure and deploys laterally outward into contact with a side portion of the inner surface of the first bladder element under pressurization of the second bladder element; and a first bladder element forming a first fluid chamber; a second bladder element within the first bladder element and forming a second fluid chamber sealed from and within the first fluid chamber; wherein the first bladder element comprises an inner surface having a first feature; wherein the second bladder element comprises an outer surface having a second feature; wherein the first feature interfits with the second feature such that a first area of the inner surface of the first bladder element is aligned with a first area of the outer surface of the second bladder element at a bonded interface; and wherein the second bladder element is exposed to the first fluid chamber away from the bonded interface; wherein the second bladder element comprises a deployable portion that protrudes inward when the second fluid chamber is at ambient pressure and deploys laterally outward into contact with a side portion of the inner surface of the first bladder element under pressurization of the second bladder element; and wherein the bonded interface is at the side portion of the inner surface of the first bladder element via the deployable portion and at opposing portions of the inner surface of the first bladder element adjacent the side portion.