i had my local sewing shop cut a hole in my liner so i
could use it as a true poncho..this is used on canoe trips
in the evening when i want to sit outside without a fire or
in my shelter sitting in a camp chair..any one who has tryed
to wrap up in a blanket or one of these slippery liners knows
how hard it is to keep on--it also comes in handy in the
mornings when you drag out of the tent half dressed or need
get up on a cool nite to relieve yourself..under a rain poncho
i assume it would keep you warm but i have never tryed that.
and--no--the hole does not keep it from being used as a
blanket..if its cold enought to have it around me in a sleeping
bag it;s doubled over or in the bag with me...however..if i was
to do this again i would have the cut out bit held in the back
with a strip of uncut materal or have a hood made up for it..

Wow. Great idea.

Great idea.
You could add a zipper on it, and 'zip it closed' for when you need it for a blanket.

peace.
al

Brigade Quartermaster used to sell, and still may, a kit for doing just that.

They still do, the Ranger Rick poncho liner conversion ...

OBG--i had a look at that kit..very clever and about time.
the liner has been around since the late 60's but thats first
i've seen of a way to make it more than a blanket..i have not
looked thru catalogs like BQ in awhile--too much "wannbe" stuff....i still wish i had a jacket made up when i was in Korea.
a poncho and liner and a field jacket and not all that much Won
and you could get a great coat made.

When I was a kid I would modify scout blankets by cutting a T shape into the middle to turn them into a poncho (or a liner that could be worn under the poncho liner). Having it open like that was never an issue unless I was using it by itself to cover up with. Later I discovered Velco. That particular type of blanket stuck to Velco...like...well Velcro!

Hacksaw--another good idea--a T cut..i should have picked a
few brains on this site before i had my liner cut up--

Treat it with any of the good DWR, Durable Water Repellents, or plain old silicone and it will roll off a considerable amount of water but still breath. Handy if you use the poncho itself as a tarp and need step out from under cover for a short time.

Reminds me of a serape. I always keep one in the truck.