I have seen the other posts about how to hide the flag in Warsong Gulch if you are a caster, though this is a way you can do it with any class.
Get the flag and into a spot that will be safe for ten seconds. Get a friend or another player to cast a netherweave bandage on you. Even if you are at full health just tell them to do it. Let them do the whole bandage and don't move. When it is finished, voila. You can also do it to other players for them. They have to have the whole bandage applied as well though.
I have only tried this with the regular netherweave bandages and i'm not sure if the heavy ones will work, though they might. This was as of patch 2.3 too.
Thanks for reading and enjoy. :wave: