Most hikers and campers have many favorite items they use, which are not big and obvious, like a pack or tent, but important non-the-less. I have recenlty researched and read articles and videos by people who have backpacked many thousands of miles, such as through hikes on the Appalachian Trail, Pacific Crest Trail and Continental Divide Trail. They often will publish lists of things they have used all over the nation (or the world) which they found to be the best available items. I have collected a short list of those items and am posting them here.
Portable battery brand for re-charging cell phones and computer tablets: Anker.
Weather application on smart phone: Dark Sky.
Map application on smart phone: Gaia GPS [this is not a true GPS using satellites but works similarly if in cell phone range].
View Ranger [also a true GPS, but has the wonderful feature of showing the names of surrounding mountans].