The most important additions to the PSP for me go like this, in order of precedence:
- Heatsheets 2-person emergency blanket — this just about doubles the bulk of the PSP, but in my mind it’s worth it
- Chlorine dioxide tablets and a backup water container (I’m a fan of the Aqua Pouch but the Whirl-Pak included in the PSP+ works fine)
- A backup knife of some kind
- A mini-Bic