Search query: camelbak backpack under $40

Product: Unigear Hydration Pack Backpack with 70 oz 2L Water Bladder for Running, Hiking, Cycling, Climbing, Camping, Biking (Gray)
Brand: Unigear
Color: Gray
Relevance: Substitute
FIT PERFECTLY: pack size of 16.5 x 8 x 6.0 inch with adjustable shoulder/ chest/waist straps, will fit chest size teenagers/kids with 27" up to adults (men and women) with 50". The chest and waist straps make sure the pack does not bounce when you move.
LIGHTWEIGHT & SPLASH RESISTANCE & DURABLE: Upgraded lightweight and Splash Resistance nylon with 2 Liter balder (in total 1.1 lb) to reduce your load and protect your belongs stay dry in light rain, and its double built-in waist straps improve its wear and tear resistance to ensure the pack’s life last longer.
REPLACEABLE 2L BLADDER: Includes a 2 Liter/ 70z BPA free bladder which keeps you hydrated. Its air flow system also keeps the water fairly cool. Includes screw cap for a adding small ice cubes for cooker drink for one day hiking, cycling, running or riding.
SMALL FRONT POCKET: The pack designed for RACING especially with a SMALL FRONT PACKET, it can ONLY hold an iPhone 6S plus, a bunch of keys and one or one two granola bars just like other customers said.
180 DAYS AFTER-SALE SERVICE : If for any reason you are not satisfied with this product, please contact customer immediately, and we will help you to solve your problem asap. The Leaking problem can NOT be avoided 100% even we have done 100% checking work before sending it to you. If happens, please contact us immediately.