I concur with the other answers, opening containers is not a big deal now. I did carry my military P-38 can opener, which fits on my keychain, but I don't recall actually ever using it.
In addition to cans, there are many items that come in resealable bags.
One item that we fell in love with in Spain that we usually don't eat much of in the US, are the olives. They have far less salt in them and much more flavor. We'd pick up a pack of them (plastic bag, or small can) some cheese, bread and sardines and have it as a lunch along the way. The olives made it all so good. We did carry a titanium spork (a camping spoon/fork) to eat our lunches with.
When we returned we hunted for similar olives and found that even when they were packaged in Spain, the recipe was for the American market: high in salt and vinegar. We found that canned olives here do have lower salt (sodium) and finally found a California olive, by Lindsay, that had 5% daily sodium that are delicious and very much like the ones in Spain.
Off topic? Perhaps? That said, check out the canned or bagged olives there. This is coming from someone that didn't like olives before the Camino!
Dennis "K1"