What does the hydration-compatibility of backpack bag means? ?

I am going to buy a light-weight backpack bak for travel, and came across bag which is hydration-compatible. I don’t know what it means. Would you explain it to me? Thanks.

there is room in the bag for a hydration unit

see the link

very useful, saves effort of getting bottles out for drinks

http://www.millets.co.uk/Walking-Kit/Hydration/Widemouth-Bladder-1.5-Lit/product/101548.aspx

Kata 3N1-10 Camera Sling Bag / Backpack

Skip Hop Zoo Lunchie Insulated Lunch Bag With friendly faces and matching zipper-pulls, Zoo Lunchies make lunchtime fun time! Sized just right for little kids, or a mom and baby on-the-go, these soft bags have a roomy main compartment that holds sandwiches, snacks, drinks and more. An insulated, wipe-clean interior keeps food and drinks cold, plus an inside mesh pocket holds lunch money, an ice pack or utensils. ZOO LUNCHIES coordinate …

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Solo Vta701 Backpack Bag $86.99 15.4″ Top zipper closure Soft no-edge padded shoulder straps Backpack Carrying Case Leather Notebook Notebook 15.4″ Display Screen SOLO Solo VTA701 Vta701 Backpack Bag www.solocases.com

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LSU Tigers Purple Collegiate Diaper Bag Backpack $49.95 Keep all of your little fan’s everyday necessities neatly organized and ready-to-go while showing off a little team spirit on your next family outing with this Collegiate Diaper Bag Backpack!

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DadGear Backpack Diaper Bag – Camouflage $89 If ample storage space and extreme organization are what you’re after, look no further than the DadGear Backpack. This roomy, rugged backpack-style diaper bag is great for traveling with the kids. It offers 13 easy to access compartments, and handy features like the Diaper Hammock and Quick Access Wipes Case that keep essentials close at hand. The DadGear Backpack is specially designed to be large enough to fit a man’s frame, and will comfortably fit mom or dad. Ergonomically-shaped, padded shoulder straps make carrying the pack very comfortably; or use the integrated straps to easily hang it from a stroller. Features: Quick access wipes window and refillable wipes case make grabbing wipes a breeze Diaper hammock keeps diapers at the top of the pack Spacious main compartment has a clamshell opening for easy access to contents Two large pockets with numerous compartments make it simple to organize and find everything Two bottle pockets accessible from the exterior hold up to 2 bottles each Light-colored interior helps you see everything inside Stroller straps attach to any style stroller and store neatly when not in use Changing pad included Durable materials and classic styling ensure this bag will last long after the diapering years. Measures 10" x 12" x 18" Gift Wrap not available. Shipping Note: This item ships via UPS Ground within contiguous United States only. Cannot be shipped to AK/HI, PO boxes, US territories, or APO/FPO addresses.  

DadGear Backpack Diaper Bag – Navy $89 If ample storage space and extreme organization are what you’re after, look no further than the DadGear Backpack. This roomy, rugged backpack-style diaper bag is great for traveling with the kids. It offers 13 easy to access compartments, and handy features like the Diaper Hammock and Quick Access Wipes Case that keep essentials close at hand. The DadGear Backpack is specially designed to be large enough to fit a man’s frame, and will comfortably fit mom or dad. Ergonomically-shaped, padded shoulder straps make carrying the pack very comfortably; or use the integrated straps to easily hang it from a stroller. Features: Quick access wipes window and refillable wipes case make grabbing wipes a breeze Diaper hammock keeps diapers at the top of the pack Spacious main compartment has a clamshell opening for easy access to contents Two large pockets with numerous compartments make it simple to organize and find everything Two bottle pockets accessible from the exterior hold up to 2 bottles each Light-colored interior helps you see everything inside Stroller straps attach to any style stroller and store neatly when not in use Changing pad included Durable materials and classic styling ensure this bag will last long after the diapering years. Measures 10" x 12" x 18" Gift Wrap not available. Shipping Note: This item ships via UPS Ground within contiguous United States only. Cannot be shipped to AK/HI, PO boxes, US territories, or APO/FPO addresses.  

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DadGear Backpack Diaper Bag – Blue Center Stripe $89 If ample storage space and extreme organization are what you’re after, look no further than the DadGear Backpack. This roomy, rugged backpack-style diaper bag is great for traveling with the kids. It offers 13 easy to access compartments, and handy features like the Diaper Hammock and Quick Access Wipes Case that keep essentials close at hand. The DadGear Backpack is specially designed to be large enough to fit a man’s frame, and will comfortably fit mom or dad. Ergonomically-shaped, padded shoulder straps make carrying the pack very comfortably; or use the integrated straps to easily hang it from a stroller. Features: Quick access wipes window and refillable wipes case make grabbing wipes a breeze Diaper hammock keeps diapers at the top of the pack Spacious main compartment has a clamshell opening for easy access to contents Two large pockets with numerous compartments make it simple to organize and find everything Two bottle pockets accessible from the exterior hold up to 2 bottles each Light-colored interior helps you see everything inside Stroller straps attach to any style stroller and store neatly when not in use Changing pad included Durable materials and classic styling ensure this bag will last long after the diapering years. Measures 10" x 12" x 18" Gift Wrap not available. Shipping Note: This item ships via UPS Ground within contiguous United States only. Cannot be shipped to AK/HI, PO boxes, US territories, or APO/FPO addresses.  

DadGear Backpack Diaper Bag – Red Center Stripe $89 If ample storage space and extreme organization are what you’re after, look no further than the DadGear Backpack. This roomy, rugged backpack-style diaper bag is great for traveling with the kids. It offers 13 easy to access compartments, and handy features like the Diaper Hammock and Quick Access Wipes Case that keep essentials close at hand. The DadGear Backpack is specially designed to be large enough to fit a man’s frame, and will comfortably fit mom or dad. Ergonomically-shaped, padded shoulder straps make carrying the pack very comfortably; or use the integrated straps to easily hang it from a stroller. Features: Quick access wipes window and refillable wipes case make grabbing wipes a breeze Diaper hammock keeps diapers at the top of the pack Spacious main compartment has a clamshell opening for easy access to contents Two large pockets with numerous compartments make it simple to organize and find everything Two bottle pockets accessible from the exterior hold up to 2 bottles each Light-colored interior helps you see everything inside Stroller straps attach to any style stroller and store neatly when not in use Changing pad included Durable materials and classic styling ensure this bag will last long after the diapering years. Measures 10" x 12" x 18" Gift Wrap not available. Shipping Note: This item ships via UPS Ground within contiguous United States only. Cannot be shipped to AK/HI, PO boxes, US territories, or APO/FPO addresses.  

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