It comes in a small plastic box that fits comfortably in your pocket. The 50 metres of cordage inside can be completely withdrawn and tied onto a pole for conventional fishing. Alternatively you can tie an overhand knot on the end and slip it onto your finger or wrist.
Take your floss box and have a rummage through your tackle to see what hooks and sinkers will fit inside the container and if possible look for flies or plastic nymphs too. However there is no substitute for live bait such as bugs or worms that you can find under a stone or log. For a float you can use a length of stick or the polystyrene balls I mentioned here: http://www.theultralighthiker.com/worlds-lightest-tarp-clip/ .
I usually carry it for emergency use (repairs/first aid) http://www.theultralighthiker.com/rope-dont-leave-home-without-it/ but it would come in handy for a spot of emergency fishing too. I guess if you are going to use it for sutures you shouldn’t contaminate it with fish hooks etc. You could attach the tackle to the outside of the floss box with some duct tape perhaps, which can also be used as a fire starter. If you want to re-sterilise your floss, pouring a little of your methylated spirit into its box would do the trick
You will notice that there are (amazingly) several kinds of self-threading needle you can use for repairs. I know the Clayxeye fits in a floss container as I have had mine there for over twenty years (and effected many repairs with it!).