Now as a long term HF Weasel user I can see there are clearly comparisons to made.
Firstly they are both very compact bags with rope of a similar weight and length, and will no doubt appeal to the same paddlers who would be after a compact throw bag.
Where the Lightning differs is as follows:
The line is attached to a short length of tape. It is this tape that exits the bottom of the bag to clip in a carabiner. The Weasel’s rope exits the bottom of the bag and when it is purchased includes a clear piping. This needs to be removed and the loop shortened if you want to use a clean rope system.
The opening of the bag is huge and is stiffened. The construction is very similar to that used in a climbing chalk bag. The Weasel is easy to pack but the wider neck on the Lightning and the fact it stays open should mean that it will be even easier to repack.
Lastly the clip. It is a bayonet type clip that contains a magnet. This helps position the two parts against each other in the correct way and it then simply snaps together. I am very impressed with how it works and am interested to see how it performs over time.
The colour is pretty cool as well!
Expect to see the Lightning throw bag in 2016.