Thanks for reminding me. The wife is into dehydrating foods and we have a Vacmaster VP112s. That's a good idea to vacuum seal first aid/emergency supplies to keep them compact and dry. As for water, do you think 3 liters in my back pack and 1 gallon in a rotopax is enough? I'm used to riding in very mild or colder temps and I only go through a couple of liters on a 3-4 hour ride.