I just now discovered these two photos on the World War Photos website. I have never seen a LaGG 3 with external tanks before. Photo captions simply state that the photos were taken in 1941. I think it would make a neat modeling project; does anybody have information on the airplane, drop tank installation or capacity? I'm guessing they are 30 gallons or thereabouts. I don't think they are incendiary stores, as I don't see a fuse or arming/detonating device.
Mike
https://www.worldwarphotos.info/gallery/ussr/vvs/lagg3/lagg-3-sep41/
https://www.worldwarphotos.info/gallery/ussr/vvs/lagg3/lagg-3-11-rs-82/
As an added bonus, I also found this very nice closeup photo of the Rs-82 rocket installation on a LaGG-3. Great modeling detail reference, methinks.
https://www.worldwarphotos.info/gallery/ussr/vvs/lagg3/lagg-3-rs/