I completely agree with OldBaldGuy. I do not leave camp without a poncho liner, and it's a good multi-purpose bag-extender for sleeping bags. I have no idea about commercial "copies" with Thinsulite. We have several poncho liners (one for each member of the family). Weight/bulk has never been an issue. One will stuff into a pretty small stuff sack, but that's not how we normally pack one. Either inside the sleeping bag stuff (on top of the bag so it's "first up") if we're on the move, or casually stuffed inside the day pack - often to cushion something or insulate lunch/water in the wintertime. They're more than worth the small weight and volume. I've used poncho liners in equitorial deserts, above the Arctic Circle, and most places in between, and I like them. I am VERY cautious around open fires, as a spark will sizzle a hole right through one, of course.<br><br>P38s... I still carry one and have a few stashed. <sigh> A couple in every case of C-Rations... they usually were taken off with the trash. I threw a lot of them away.<br><br>Let us know if you have difficulty locating a poncho liner.<br><br>Regards,<br><br>Tom Ayers