Even for day hikes, day-long scouting trips, bouldering or kayaking for the day, one should have a small day-pack with a few essentials and shelter is one of them. I built my day pack from an Osprey Manta 30 hydration pack and it’s pretty much my three-season day kit for trails, hitting several of the small summits in the SE Appalachians. Temperatures are moderate and rarely dip below freezing for more than a few hours for most of the three seasons (I take a few more precautions for actual winter months).
My intent is just enough to ride out a severe afternoon thundershower for best case and just staying overnight if I suffer a mechanical injury late in the afternoon. Outside of some very remote locations and with proper pre-planning, most rescues occur within 72 hours; hence most refer to these as 72-hour kits.
Your first line for shelter is planning for and wearing appropriate, seasonal clothing that can be layered and includes wet weather gear, hat/gloves and even a spare pair of socks. A small day-hiking pack allows you enough room to store layered clothes depending on the activity to maintain proper thermoregulation. Even though I include a poncho (Exped Bivy-Poncho), I still prefer a dedicated pair of rain pants and jacket. Not only are they an extra layer when needed, if your hiking pants/shorts get soaked, you still have something to wear and provide some protection from the elements…planning layers gives you several options.
I carry four additional shelter items for my day kit, specific to my area. I wish the Exped Bivy-Poncho was sil-nylon, but it’s still effective rip-stop polyester (similar to the USGI ponchos) and compresses well. Not only a poncho, but a well designed tarp or even a bivy bag. Rolled up, it includes suspense line and guy lines for setting up as a lean-to (using my hiking poles) along with four of mini Groundhog stakes. Second item is the compact Heat-Sheet Bivy bag. Third is a large, heavy-duty trash bag (multipurpose) and lastly is a small section of closed-cell foam as a sitting pad.
These all help to defend against the affects of precipitation, conduction and convection which all contribute to hypothermia and are the biggest threats to address. With the rest of my kit, I can easily hunker down for a few days as my water bladder capacity is maintained on the trail (three liters) and I have the ability to filter or boil from non-potable water sources. Add a fire with a lean-to shelter with a decent reflector and survival quickly becomes just slightly uncomfortable.
Again, that is just a day-hiking or other day-long activity shelter kit I always take with me for the majority of the year. I’ll augment based on the activity and actual weather conditions as a compact Trek-Lite hammock is excellent when it’s really muggy and buggy. If I’m planning on an overnighter or more, it’s a dedicated hammock or tent shelter.
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