Hi..
ok..I'm stubborn,
ive carry my -15c synthetic, big, heavy sleeping bag with me on my hikes in Scotland.. and its done well in my hammock and ground.. its not going to be helpful on the AT!

im not ultralight, not rich, not into brand names..
I did the west highland way with my axe and saw.. with my 3y old 100l ebay bag! & too avoid over priced food on the trip.. carried most of my food for the 96miles.. stubbon I tell you.. lol
last year I walked 500 miles in a circle, cost2cost, Sothern upland way, up and down the coastal paths! so I don't mind walking and did planed on using most off my gear! to save money.. don't think its going to work!

as the AT is going to be a different hike, I'm telling myself..... make it easier on yourself!

I've been looking at info on Thetrek and they suggest around -6c, people send one home and pick up a summer one..etc
and to be honest I have dyslexia I don't get weights and getting lost with all the numbers.. down 900..850.. I just cant take the info in!
I just buy what I can afford, put it in my rucksack, pick it up... if it feels ok, great hike away...
hope that explains where I'm coming from!

with great advice off here, to pin pointing items, I've got a new hammock and tarp... lighter then my normal ones.
now for the sleeping bag!

what bag are you taking?

I only want to buy one! can't post back to the UK.
bag and liner?, post bag up the trail when warmer!
or get one to cover the cold temps and sleep on top in warm weather (my normal way)

this is one I managed to find! will it be any good for the trail? or is it crap!? for me the price is ok..is half the weight of my normal bag!

PipeDream 600 Hydrophobic lightweight sleeping bag -12˚C limit 3 - 4 season lightweight sleeping bag weighing 1085 g
https://www.alpkit.com/products/pipe...SABEgI9AvD_BwE
or
PipeDream 400 Hydrophobic down sleeping bag -6˚C
will need xlong added weight there..

any help would be appreciated