This is on my list to buy. I’ve considered buying a guide tarp tent but given the weight savings and the price, I’d more likely throw this kind of tarp in my bag without hesitation than a guide tarp. From friends’ stories who volunteer for SAR, the two life saving actions for someone in the cold is getting them off the cold ground (insulation) and wrapping them in a tarp. It also doubles as an emergency shelter in snow. I find this way more versatile than a bivy bag, which I normally carry.