gmax 3 4 motorcycle helmet OF-77 Reform Matte 3/4 3 snap double and single lens available Gmax GM32 Solid Helmet

The under seat bag measures 46x36x20cm and has a spacious capacity of 30L, making it suitable for all major airlines such as Spirit Airlines, Frontier Airlines, and EasyJet

ACCULOCK FIT SYSTEM Customisable, secure internal adjustment

You cant confidently submerge it without risking the contents, but I cant think of a scenario where youd actually want or need to do that anyway

To fix the problem of movement and ease my concerns about straps failing, I do two things

Torso Sizing Our Backpack from offer adjustability to fit a range of people with different heights and proportions

Batac: Lightweight with comfortable straps