These five waterproof backpacks are basically under $50, but the quality is really good, and can provide good protection for your belongings, so please read this guide
Preseli Venture, one of the first to start coasteering tours, has been offering them for 25 years
However, this isn't much of an issue if you plan to fill it up with school gear daily

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This is particularly true in California as many new regulations, including restricted access (limited entry), quotas, and time and area closures have been implemented, especially since the mid 1990s, resulting in the downsizing of many California fisheries