Airtight Zippers:The waterproof fishing main compartment features a fully waterproof, TRU airtight zipper, IPX8 waterproof rating, with a safety pull at of the zipper. For airtight zippers please pull the zipper all the way to so that the zipper is fully closed, and before submerging the backpack in water, please on the outside to make sure that there is no air leakage. The zipper is a little tight,it become smooth with more use. If you can' pull the zipper, it's not that it's broken. You just need to try again a few times to pull it open smoothly. Colour:Black Material:TPU Package Contents: 1x Fishing Tackle Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.