Decathlon MT100 Self Inflating, Insulated Backpacking Sleep Pad, Gray, 1.8 lbs, 70.9" x 20.5". Our designers, all backpacking enthusiasts, created this mattress to insulate you from the ground and to sleep while backpacking or bivouacking.1.8 lbs. 70.9" x 20.5" x 1". Self-inflating mattress, comfortable and compact. Efficient 2-way valve with anti-return for easy handling.. Weighs 1.8 lbs. Volume: 7 liters. Carry bag.