Bob, do a search on "rollup" and "flexible" solar panels. We use these bad boys in ham radio circles. They will seem expensive until you understand that surface area is the name of the game and these things are big.
Regardless, the problem will always be weight and available sunlight. Unless you are hiking desert floor in stark sunlight, you won't likely get a good charge. You'll have to park yourself for a day, with good southern exposure to get a good charge.
You can build a voltage regulated lithium ion battery bank that is lighter and will charge your appliances several times during a week long outing.