This dilemma is connected to my guerilla-grow site plans. I do a lot of fishing in the spring, summer and fall. Here in the south, this can often take you way back in the boonies following a winding river or creek to some very remote locations. Since this also involves carrying a lot of equipment, no one gives it a second thought if they see some guy with a massive tackle box (with the customary rods/reels). A large Plano or Orvis tackle box can be modified to carry a respectable amount of legit fishing gear on the front, with the roomy inside dedicated towards cultivation materials. I've taken 4-6 week-old babies, simply put into large quart-size zip-locks with a few pencil sized holes poked in them for ventilation. Root disturbance is minimal or non-existent with little risk for transplant shock.
Since fisherman (and the game-warden) have their attention firmly transfixed on the water, detection is highly unlikely. The closest I have came is from curious fellow-fishermen and they only want to know one thing the whole world over- " well, how are they biting?". Even if the bass are attacking anything and everything in the box I invariably respond " not a bite all day". Just make sure if you do this that you have your collective act together as far as fishing license, trout stamp etc. Officials with the state don't give a damn what's in the box. Just what's in your wallet.