I've read some threads on the Microraptor Pro Case and a few times people have mentioned that it is air tight and the case can collapse after pressurization and de-pressurization as a result of flying in planes while traveling. It's been mentioned that there is some kind of ring under a latch that can be removed to allow the air pressure to equalize from the outside to the inside. I can't find any info in either the instructions, manufacturers website etc. Does anyone have a procedure for remiving this ring? And where on the case to find it? Thanks.