I have just received my invoice for a RG 500D and a 420D 1.5 Lite. The weight disappointed me a bit as well. I'm actually going to change my order and just get one of the bags because of it. Im thinking the 420D but I'm afraid it won't be as sturdy and keep it's shape while empty or half full as the 500D. Can anyone comment on the 420 DR sturdyness or stiffness? I have no doubt it is a durable material though. Does anyone have and use the Matryoska pouches by the way? I don't know if I should order the deep pvc/mesh version or just the original smaller pvc ones. Any thoughts on the different materials or sizes?