Review on Fit Seal Hydration Backpacks Snowboarding by Christian Bar

It's very difficult to put the cork in the bottle but once it's in the bottle and shuts well the pressure from drinking the water breaks inside the bottle, together the air is sealed because the seal cannot penetrate to replace the water drunk. With a plastic bottle, if you remove the cork to let air in and then try to replace it, it won't work because the walls of the bottle are already dented from the pressure, meaning you can't push the cork back in again . . When using with a glass bottle I'm wondering if the bottle will break the pressure (I won't try) or if using an aluminum bulb will the suction eventually stop or become impossible to get the cork? Because of the internal pressure? Also, there is no strap, holder, handle, hose tie to attach it to a backpack or clothing so it dangles. Overall, the design is interesting and chic, but not very functional.