A furniture element is characterized in that it comprises a first flexible inner envelope (30) defining therein a first volume (22) adapted to receive a material comprising a fluid with a first density and a second flexible outer envelope (10), the inner envelope and the outer envelope defining together a second volume (21) surrounding the first volume (22) and adapted to receive a second material comprising a fluid and flexible particles with a second density higher than the first density, a first closable port (40) for entry or exit of fluid into/from said first volume, opening to the outside, and a second closable port (50) for the entry or exit of fluid into/from said second volume, opening to the outside. The invention can be used in particular for improving the comfort and facilitating the transportation of large volume seat-type or cushion type elements (typically from 0.2 to 1 m2) for outdoor use (terraces, swimming pools, etc.).