The EVA suits continue to operate on only oxygen though, which makes sense given that internal suit pressure is a major challenge for manoeuvrability as was famously demonstrated by Alexei Leonov during the first spacewalk. This does mean that astronauts spacewalking from the ISS need to prebreath pure O2 to purge nitrogen for preventing the bends, a detail that was captured in the Netflix SciFi film Stowaway.
https://www.youtube.com/watch?v=0FKxM-zNZBk adam savage talks a lot about it during this video, but yes, bending a baloon is a good example. A better one might be a fully inflated inner tube or filled camelback.
