If you're serious about survival and bushcraft why not buy a 1000' spool, one in olive drab for winter and one in white for summer. Bright orange seems like a good idea but it just turns brown as it gets dirty. You keep that spool at home or at your camp and when you need emergency cord to pack in your survival kits, you just measure it by arm spans. You need some to practice anyway. Mors Kochanski recommends 7 arm spans but that is according to his settings and predictions, like getting stuck in the boreal forest and having to build Roycroft snowshoes. Nylon paracord is ideal for lashing because of its elasticity, but you should gut it (remove the seven inner strands) in this case.