i bought this set for my triprecently. there are two compression cubes , one large packing cube with dual side and one under garments cube in the set. the compression cube works but you really have to try very hard to zip up the clothes. I managed to compressedtwo big north face duck down jackets (with lots of effort) in one pack; one big wolly jumper,one big duck down, one thermal and one pair of gloves. without using as compression cube, they also serve as good packing cubes.
Great for shorter trips or holidays (if you're planning on a long stay somewhere, I suggest purchasing two sets). The bags are very sturdy, and the zippers seem strong enough to hold. Overall, a great travel set.