The following is a tutorial on using waterproof backpacks, but this product has no text. Please refer to the pictures for the actual product

Roll up the sealing area of the waterproof bag a few times, and then fasten the button. When using, please try not to soak the sealing area in water.

Package List:

1* Dry Bag
1* Phone Case

Specifications:
Material: 500D PVC tarpaulin, PVC+plastic
Color: Blue, Black, Gray, Orange, Yellow, Cyan
Capacity: 15L
Dry bag size: 40*22cm/15.6*8.7in
Shoulder strap size: 65-115cm/25.6-45.3in
Phone case size: 18*10cm/7.1*3.9in
Detachable Lanyard Length: 45.5cm/17.9in
Package weight: 450g/15.9oz

15L waterproof PVC sealing bag sealing device, floating backpack with phone case, dry walking bag, folding dry bag, top dry bag, used for boating and fishing

Features:
Ergonomic Dry Bag: Features two adjustable shoulder straps for comfortable carrying. The elastic rope for holding clothing or accessories.
Perfect Size: 15L dry bag(13.8*8.7in) with a large capacity. The phone case(8.1*3.9in) is suitable for phones up to 6 Inches of diagonal screen size.
Waterproof: The dry bag is made of waterproof rugged 500D PVC tarpaulin, with waterproof coating. Waterproof phone pouch is made by quality ABS+PVC with reinforced lock system, which protect from water, dirt, dust and mud.
Touch-friendly Phone Case: The transparent waterproof phone case is designed to use your cellphone as normal without taking your phone out of the pouch.(Not for fingerprints!)
Multifunctional Set: Perfect for all outdoors activities, like diving, skating, kayaking, boating, sailing, canoeing, surfing, fishing, rafting, hiking, camping and beach activities etc.

Note:
1. Please do an easy waterproof testing before water activities.
2. Item color displayed in photos may be showing slightly different on your computer monitor since monitors. Thank for your understanding.