they are called demijiohns

HI....yes there are demijohns and then there are 3, 5, 6, 10, gal carboys....find a wine/beer making store that is what these big jugs are made for.....they cost any where from $15 to $70 new.....linda

Slightly off topic....

I'm not sure how many terrariums you've done before but I would recommend for carnivorous plants using a jar you can get your hand into.

In my experiences with them there is a lot of pruning and picking off dead mandibles and pitchers and planting in a bottle may prevent you from being ale to do this.

I just bought one at pier one imports

you mean similar to that one above? how large? I would love to get my hands on it. can you post a pick? I'll run to my pier one!