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50L Hiking Backpack Waterproof Camping Backpack with Rain Cover Travel Day Pack Bag with Shoe Compartment for Backpacking Climbing - Walmart.com
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The North Face Borealis Backpack - Carry in comfort to the gym, school or out on the hill. - YouTube
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Amazon.com : Seamand Hydration Backpack with 3L Water Bladder for Hiking and Climbing (ACU Camo) : Sports & Outdoors
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Amazon.com : SEMSTY 20L Hydration Backpack with 2L Water Bladder, Insulated Hiking Backpack with Rain Cover for Hiking Cycling Camping : Sports & Outdoors
![What is that little opening for on my TNF Borealis backpack? I'm able to poke my finger into the pocket when the zipper is closed. 2nd photo: what is the Velcro strap What is that little opening for on my TNF Borealis backpack? I'm able to poke my finger into the pocket when the zipper is closed. 2nd photo: what is the Velcro strap](https://i.redd.it/m7384iecd6p71.jpg)