An ideal CPR shield to include in your IFAK. A more basic design than many of the valved models, but takes up much less room if your storage volume is tight (& if it's less bulky, you're more likely to use it as EDC... thus more likely to have one when you need it!).
I hope to god I never , ever need to use these. I opened one up to familiarise myself in the event of CPR. These shields are simple, durable and will do the job well if you ever have to administer CPR. ALL our workplace boxes now contain these.