MacGyver Tip: Got blisters? Use Duct Tape.

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Are blisters ruining your day? Do band-aids keep sweating off? No moleskin on-hand? Try duct tape! It cushions the blister and won't come off. Many walkers and runners swear by it.
Apply the duct tape when you first feel burning and, hopefully, before a full blister develops. Lay it as smoothly as possible, avoiding wrinkles.
Blisters already exist? Shield them from the duct tape glue. Cut out a circle of paper or gauze, attach it to the center of the duct tape and cover the wound with the non-sticky part.