How to Choose & Use a Backpack - Infographic from REI. Recommend you ignore the 4-6 pound recommendation for an expedition pack and get a 2-3 pound pack. If you're backpacking 5+ days, you'll want the least weight possible. Big packs also increase your desire to fill them which increases weight. Tip: buy all your gear first, then buy the smallest, lightest pack that will carry it.
This survival guide would've come in handy to Pi while he was at sea. Even though some of these animals were never encountered, some were. Pi could have understood how to better deal with these dangerous animals.