I’ve alluded to their use before when discussing toe-up socks and heel placement but one of the things I really recommend that every sock knitting bag has neatly stashed is a little roll of dental floss. It makes the perfect lifeline especially for socks where the stitches are likely to be very small. Using thicker yarn as a lifeline can distort the stitches and thinner yarn such as laceweight may not always have the required strength needed to stand up to being your lifeline.
A small roll of dental floss is brilliantly compact - and comes with it’s own little cutter. All you need to have to hand is a tapestry needle which your bag probably already has and you are good to go. Whenever you come a tricky point in your pattern or if you feel like you just need that little bit of extra reassurance, you can just whip in alifeleine in a matter of minutes and your sock progress is safe and secure.