Canvas EXTERNAL USB INTERFACE and HEADPHONE HOLE – External USB with built-in charging cable. You can easily and conveniently charge your phone, tablet and other devices without opening up the backpack. Also coming with charging cable. The dimension of this crossbody backpack bag is 11.8 x 6.3 x 17.7 inches (L x W x H) and weights 0.35kg, lightweight and portable. Features with earphone hole, listen your music more conveniently. LARGE CAPACITY and MULTIPLE COMPARTMENT – 5 pockets in total- 1 main pocket featured with 1 iPad compartment; 1 front zippered pockets to separated your items. 1 back zipper pocket for secret storage and anti theft. 1 drawstring-closure bottle pocket sided the sling bag can be put into your water bottle holder and umbrella, you can take all your daily necessities all in this canvas sling shoulder backpack. BREATHABLE and SOFT PADDED BACK – The back side of our sling backpack bag comes with protective padded design, breathable and comfortable, easy to carry throughout all day. ADJUSTABLE and BREATHABLE STRAPS – The breathable mesh straps are padded, providing fresh and comfortable carrying experience for your shoulders, with adjustable function, you can adjust the length according to your needs, with the buckle, you can easily take on and off this shoulder sling backpack, a very convenient sling chest backpack. WATER and WEAR RESISTANT – This sling bag with water bottle holder is made of special linen material, which is water repellent, easy to clean and anti-wear, effectively prevent it from tearing, wetting and ripping. REVERSIBLE SLING BACKPACK – 2 buckles are designed on the left and right side of the sling bag and you can carry it according to personal habits cause it is reversible. PERFECT CHOICE FOR OUTDOOR – This water resistant canvas sling backpack bag for men and women is much more secure and relaxing for most outdoor activities or recreation like hiking, vacations, biking, cycling, rides, motorcycling, gym, running, walking in the park with the dogs, festivals, raves, music festival, amusement park, theme parks, etc.