FSGLI provides up to a maximum of $100,000 of insurance coverage for spouses, not to exceed the amount of SGLI for the insured member, and $10,000 for dependent children With FSGLI, life insurance for a military spouse is issued in increments of $10,000, at a monthly cost ranging from $.55 to $5.20 per increment.
The sweet spot for most hiking and multisport daypacks is 30 liters (around 1,830 cubic inches). That's enough capacity to hold the Ten Essentials (for the list, see the REI Expert Advice article, the Ten Essentials) plus some extras. Sizes vary by intended use.
I suggest reusing the plastic bottled water bottles, they're a good size and very lightweight when empty, and you can easily bring 3-4 for a longer hike. Water should be the heaviest thing in your pack and preferably easily accessible while you're walking.