Hiking is one of those outdoor sports that's great for late summer and early fall, when warm weather begins to cool. When you go for a hike, it's a great idea to go with someone who has trekked the trail or mountain you're planning to hike. You need some durable hiking boots and some wicking socks to go with them.
You're also going to need a comfortable pack to hold your water and gear. Check out this Kelty Range Daypack. Like the name suggests, this pack has a whole range of uses. There's a roomy, padded main compartment that features an interior sleeve that can be used to carry a hydration reservoir (like one from Platypus), a journal or laptop.
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There's also a pocket for your iPod or MP3 player with an exit hole for your headphone cords, if you like to hike and listen to tunes. There's also a front zippered pocket you can use to hold your cellphone, camera, snacks, a long sleeve shirt, a lightweight raincoat, a first-aid kit, or whatever. You can also use the 2 mesh side pockets to hold stuff for easy access.
If you're carrying a heavy load, there's a removable waistbelt and adjustable sternum strap to cinch the pack to your body for added comfort and stability. I know when I'm hiking up a mountain, I get really hot, and this pack features air-mesh padded shoulder straps and a padded no-sweat backpanel with venting channels to help keep your back dry.
You can order this versatile Kelty Day Pack from REI.com for $70. It comes in denim/navy (as shown) and caramel/brown. It's the perfect size for any day outing.