CONTINUOUSWAVE

The advice is to carry/wear a sharp knife somewhere you can reach it when your enormous lifejacket gets in the way, the divers knife is just what I have and keep sharp. It is convenient in its solid plastic sheath to wear on my leg.
Dave Weight

Just make sure that when your life jacket is inflated that you can reach and operate all of these attachments, your lifejacket will be bigger and more in the way than you would believe. I strap a divers knife to my leg as suggested by the Royal Yachting Association.
Dave