Five compression bags that squeeze soft items flat before they ever reach the suitcase. Clothes, underwear, socks and shoes go in, the air is pressed out, and what was a loose armful becomes a slim rectangle that stacks.
The bags are made of plastic with a waterproof surface, so damp swimwear or muddy trainers can be sealed away from clean laundry on the trip home. Total weight for the set is around 0.2 lb, which is negligible against the space they recover.
These are the small size, meant for packing inside a case rather than for storing bedding at home. Keep one empty on the way out and it becomes the laundry bag on the way back.
