A slight digression that some may find helpful... as told to me by an Survival Instructor who likes to keep things simple.
I take no credit nor assume any responsibility for the following (if anyone sees something wrong then pls speak up) but what he said to us was...
"All of our potentially fatal Venomous Snakes, Cone Shell, Blue Ring Occy and Funnelweb Spider venom etc primarily attacks via the lymphatic system"
"If you get bit by something that will kill you, apply a PIB, immobilise and do not elevate"
"If you get bit by something that won't normally kill you but will hurt like the bejesus apply an Ice Pack and rest"
"Don't put a PIB on a non fatal bite as the area will want to swell and the pressure bandage will be excruciating
Given the above then a specific 'Snake Bite Kit' is handy as a lot of First Aid Kits won't have enough bandages to do a decent PIB