Get you home puncture kit.

I have been out with buddies who have had to use them. On both occassions the puncture was fixed and it was then a personal decision by the user to subsequently replace the tyre. The advice seems to be never use a plug in the side wall. You can buy plugs, gas cylinders and glue as individual items to replace used/lost items e.g. ebay item 141033325225 ebay.co.uk/somersetcommercials. The pack you highlighted looks fairly expensive.