A friend of mine told me to look into snowboarding back packs / cycling. This would be an example with the built in protector.

USWE Patriot 15L Hydration Pack with Back Protector, Bounce Free Backpack for Mountain Biking, MTB, Off Road Motorcycle, Orange Black https://www.amazon.com/dp/B07QPV4YTQ/ref=cm_sw_r_cp_api_i_YQC5AMKCJMQ3E7S38T76