>>968111nnnnnnnnnnice, also >trips
>>968257>carry with youYou've got a good start.
Of what you have listed, I'd drop the hatchet... bring a folding camp saw or pocket chainsaw instead. I carry a folding saw, mainly use it to clear trails on spring rides... once trails are cleared I don't really worry about it. Might bring it, might not.
Pretrip the bike - check fluid levels, tire pressure, service intervals, bolt check, etc before you leave the house.
Tools - I have a small tool wrap with most of what I use to maintain the bike. Work out of that in the garage when you're doing maintenance - much rather find out I need a 6mm allen wrench when i'm in the garage than when i'm out innawoods. Couple of extra bolts, hose clamps, washers, zip ties, etc for when something rattles loose (on that note, loctite almost everything...).
Old pic, I've changed a few things, but >pic related.
Carabiners are handy, along with the mule tape.
Trash bags (the heavy kitchen-size ones) have a lot of uses. Trail map. Extra gloves/socks. Basic FAK. Toilet paper ("mountain money").