You don't need a giant pack for a day hike.
20-35 Liter Daypack
Go to REI and try several on
Choose one that feels good on your back
Otherwise, the REI Co-op Flash 22 should be fine
You'll need an appropriately sized daypack for you outing.
Sometimes used for a very short hike or to carry around items at camp
May be all you need for an urban hike where you just need something to carry a light jacket and bottle of water
Minimum size to carry your gear on a hike
Summer time only and minimalist packing
Good size for a daypack
Enough room for your 10 essentials, jacket, lunch and water
Winter Daypack can carry your extra clothing
Used to carry extra gear for your activity
May be used to carry group meal - like a watermelon
Some Scoutmasters will carry this and extra gear for the troop
A Daypack MUST fit
If it isn't comfortable, it's not the pack for you
Go to REI, load up packs with weight and walk around the store to find a pack that fits
Most packs will come with these
Allows for easy access to water bottle and snacks
Pockets on shoulder or waist straps can really come in handy
Use for snacks, map & compass and phone/camera
Daypacks don't need to be name brand or new. They just need to have the proper capacity and fit.
REI
REI known for affordable gear
REI Co-op Flash 22
Affordable for a name brand pack
Weight: 14oz
Basic top-loading daypack
REI Co-op Trail 25
Weight: 2lb
Panel-loading daypack
Heavier and more expensive than Flash
Very basic "hipbelt"
REI Co-op Traverse 32
Weight: 2lb 9oz
Built like a backpack
Much more durable than other daypacks
More than you need, unless you need to carry a lot of extra gear
Deuter Speed Lite 25
Deuter is a German company with a long history of making quality packs
Packs are designed to last
Deuter Speed Lite 25
Weight: 1lb 9oz
Very popular daypack
Pockets on shoulder straps - not everyone likes these
Pocketless CV version available
Osprey
Osprey has several other lines of daypacks
Osprey tends to have LOT of bells and whistles
Popular feature and heavier packs
Osprey Talon 22
Weight: 1lb 14.6oz
Nice daypack with basic features
Osprey Stratos
Heavier with more features
Built more like a backpack than a daypack
Osprey Stratos 36
Weight: 3lb. 4.5oz
Can carry a good amount of gear for a day event
Built like a backpack - can be used for overnighters for those who pack really light (cabin dwellers)
Osprey Hikelite
Lighter
No hipbelt
Osprey Sportlite
Lighter
Still has hipbelt
Osprey Skarab
Comes with build in water reservoir
Osprey Manta
Premium hydration daypack
Osprey Daylite Plus 20
Weight: 1 lb. 4.6 oz.
Designed to be a travel bag to attach to larger luggage
Suspension isn't great
Lower priced for Osprey
Mystery Ranch
Build heavy duty packs, including packs for the US Military and for hunters
Mystery Ranch Gallagator 25
Weight: 1lb 4.8oz
Vest-style harness - love it or hate it
3-Zip access is good for travel
Gregory
Known for making heavier duty packs
Gregory Miko & Maya 20 Pack
Weight 2lbs
Basic daypack with lots of pockets
Adjustable sizing
Gregory Nano 22 H2O
Weight: 1lb 2oz
Water reservoir system similar to Osprey Skarab
Skarab is arguably better and more comfortable
Zulu 30
Weight: 3lb 0.6oz
Large for a daypack
Built like a backpack - competitor of Osprey Stratos
Arc’teryx Aerios 30
Known for technical gear
Arc’teryx Aerios 30
Weight: 2lb
Technical Daypack
Body hugging cross between running vest and backpack
Arc'teryx Mantis 26
1lb 13.6oz
Less expensive option from Arc'teryx
Comes with Arc'teryx logo
Black Diamond
Makers of technical mountain gear
Black Diamond Distance 22
Weight: 1lb
Designed for running
Black Diamond Pursuit 30
Weight: 1lb 12oz
Body hugging fit
Designed for summiting
Less expensive than that Arc’teryx Aerios
Hyperlite Mountain
Known for Expensive, Ultralight Dyneema packs
Hyperlite Mountain Gear Daybreak
Weight: 1lb 5oz
Internal Volume: 17L
External Volume: 6L
Zipper opening
Hyperlite Elevate 22
Weight: 1lb 1.7oz
Roll-top closure