I agree- ration bars are somewhat fortified with vitamins and minerals. They're also way less thirst provoking than a dry cookie. Plus the packaging is much more robust.

While I haven't tried the Mayday ones I can say I could absolutely wreck a block of Datrex bars! I abso-freakin'lutely love 'em, could eat them every day if they weren't so carby. grin
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman