Best to have both. The Z-Fold is designed to be used as packing INTO a larger wound, whereas the smaller patches go INTO or ONTO a smaller wound. My leg wound was small so not really packable, that's where the smaller gauzes would have been better suited. But, if you can only have one, go for the bigger z-fold as it gives you more options.
Any EMT people feel free to jump in here and help out with advice
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