Sometimes one needs a more substantial shelter than what most tents can provide. Someplaces defy setting up anything but a "stand alone" tent. In a long term Bug Out scenario, something more substantial than a tent will be needed. Sometimes one gets unexpectedly caught out in the woods during a cold night. What kind of shelters can one put together in a short amount of time with only a knife? Apache Wickieup: Good when there is a stand of young trees. Pull down the tops of the young trees, in a circular pattern and tie them together about 3-4 feet above the ground. Cut many small branches from neighboring trees and horizontally weave those limbs in and out among the vertical trees so as to basket weave walls. Leave a 2 foot hole at the top where the vertical tree tops are tied together. One can now, if time is available, vertically weave small branches into the walls to plug holes and make the shelter more windtight. Make sure that you leave a 2 foot opening at ground level as an entrance on the leeside (downwind). This shelter takes approximately 2 hours to build, under optimal conditions! I'll be back to post other shelters such as "Brush" and "Lean To" shelters. I would appreciate everybody's expertise added to this thread!