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The original was posted on /r/Ultralight by /u/FuguSandwich on 2024-03-07 19:16:13.

I bought a Spark 1 (40F) a few months back on a great sale, mainly as a just-in-case bag for day hikes in the wilderness. Saw they discontinued them a few weeks back and then today got the email that the “new and improved” ones are here. Was bummed that I possibly bought an inferior version, but that seems to not be the case.

Old Spark 1:

40F EN Lower Limit

Bag Weight 12 oz

Fill Weight 6.3 oz 850FP

Compressed Volume 1.5L

New Spark 45

45F EN Lower Limit

Bag Weight 12.8 oz

Fill Weight 5.3oz 850+FP

Compressed Volume 2.4L

So it got heavier, bulkier, and colder while the price remained the same. Looks like they made it slightly bigger (admittedly the one I have is a bit tight) and switched from 10D face/7D Liner to 10D for both.

Most of the other models experienced similar.