2) PC Case carrying strap
There are a few things to note
1) Do not attempt to carry a aquarium full of water with this method.
2) I am unsure, but I believe the straps will only fit a standard 5 gallon or 10 gallon x-long aquarium.
The reason I say this is, the glass on the side of the aquarium/terrarium was not designed to hold a lot of pressure the way it would be applied by the strap. If the aquarium is full of water chances are the glass will break under the weight (assuming you can lift it). Also, If you attempt to try this on a tall aquarium, the glass is also more likely to break.
(Forgive the crappy photos, I took them with my cellphone)
Step 1: Layout Straps
Step 2: Place Aquarium/Terrarium on Straps
Step 3: Clasp Straps
As a side note, chances are the single strap that is suppose to go around the case length wise will not fit around the terrarium/aquarium so remember to tuck it into one of the other straps so you don't trip on it while walking.