Uploaded by clean 
2500x1848 PNG 2.67 MB
Interested in advertising on Derpibooru? Click here for information!
Help fund the $15 daily operational cost of Derpibooru - support us financially!
Description
Nurse Redheart, conducting a lesson on how to not die horribly.
hm… i never knew that! :D i probably should of, being a gas mask collector… x3
This way you can have bigger and heavier filters that last longer, and you are carrying them in a special bag (and the bag itself acts as a very rough filter, so the real filter doesn’t get quickly jammed by big particles). Of course this is a rather old gasmask design.