The Best Backpack for Two Hours or Two Months

Sierra Magazine posted a nice little story listing their selections for their favorite backpacks, whether you're hitting the trail for two hours, two days, two weeks, or two months.

They start off their list with a daypack from ChicoBag called the DayPack rePETe. It comes in 15 and 20 liter varieties, sports a couple of bottle holders, and enough room for lunch and not much more, but is also made out of 95% recycled materials.  Cost: $20

The selection for a two day back is a bit more conventional, with the Talus pack from JanSport earning the nod. This is a 35 liter pack that adds a few more frills such as hydration sleeve, trekking pole holders, and plenty of storage for an overnight in the woods. Cost: $120

There is a significant jump up to the next packs, the Baltoro 70 and Deva 70 from Gregory, which would offer plenty of space and options for a two week long trek through the Himalaya or just about anywhere else. These are the full on, real deal, travel packs for active escapes. They have pretty much all the features you would expect, including hydration, suspension systems, and massive 70 liters of storage.  Cost: $290

Finally, the two month option goes to the durable and versatile Arc'teryx Altra models. Like everything from Arc'teryx, they are pricey, but amazingly high quality too. This is a big, 75 liter pack that can get you through the long haul anywhere. It's also well regarded for it's comfort and ability to carry a load. Cost: $400.

There are some cool packs on the list, but I'm still a bit partial to the offerings from Osprey. What are your picks for these packs? Any good suggestions?