The bags are bigger than I had thought from the item description. The clearest way to communicate the size for something like this is via capacity. The packaging (and bags themselves) both clearly state that the volumes are 2.5 L, 4 L, and 6.5 L. (The item description leaves this out completely.)The item description says the diameters are 4", 5", and 6.26". This is the diameter *when filled*; not when laid flat. When laid flat, the diameters are 6.5", 8", and 9.5" (exactly pi/2 times larger) and the heights are about 9.5", 10.5", and 13".For ultralight backpackers nerding out on weight, the solo bag weights are: 22.7 g, 31.5 g, and 40.2 g. They're fairly thick and sturdy and slightly heavy.