IMHO ... too many sharps, replace with food. I don't see any repair tools, wrenches, spark plugs, etc. Add sunscreen, spare glasses.
Given that weight is not an issue, I'd go with a 3l camelback hydration pack or similar.
Under communication -- Leave a trip plan, consider family radios.
If you are talking Winter, add pocket heat packs, a sleeping bag and pad, possibly a camping stove for quick hot food. <A white out storm could leave you 40 miles out overnight>
Teacher