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I would line a duffel/gym bag with clothes, put the computer in, wrap more clothes around it, zip it up, put the 2 handle-straps around my shoulders and have someone either use cord or straps to secure it to my waist and chest.
Trying to rig it up to your body with cord alone is going to, at best, be uncomfortable as hell for anything longer than a 100meter walk, at wost, slide through and smash the thing.