Depends on how large. My bite happy dragon was pushing 3' when it arrived and it was not staying in a bucket. I dumped it into a net over a garbage can. It went directly into the tank.
My fimby was about 1'. I floated it, it shot out of the bag as soon as I opened it. Luckily it landed on the glass top and then fell into the tank.
My moringas were shipped in bags inside of large plastic jars which made floating and acclimating easy. I floated the jars, acclimated the water. Pulled the bags out of the jars, eel stayed in. Put the jars back in the tank and moringas swam out. There was never a chance of being bit, it was great.