A bivy sack will keep you warm and dry. Many people use them when they are climbing on a steep cliff and can't bring a tent and a sleeping bag. Usually blazes are put high enough up the side of a tree so that they can still be seen in the winter when deep snow covers the ground. Blisters start as sore spots that will become full blisters if nothing is done to stop them. As soon as sore spots begin, you should stop and put tape or moleskin on them to keep them from getting worse.
Wet feet are also more likely to become blisters.
Boulderin g is a way to practice rock climbing without having to worry about falling a long way. When you do bouldering you should have another person standing behind you to help if you fall. Bowls are popular to ski in during winter when there is a lot of snow. Stretchy cord used to hold things together. Bungee cords are good for attaching things to backpacks.