You can put a little toilet tissue in these containers to cushion your find. When you get more experience with rock hounding, you may want to get a rock hammer and a couple of cold chisels. Some good spots for looking for specimens for your collection are along beaches among the rocks, in gravel where you find it - even your own driveway, sometimes. Interesting rocks and minerals can be found almost anywhere. Another way to add to your collection is by trading with rockhound pals.
Some people have penpals who collect minerals and they trade by mail.
This is one way to get minerals from distant places around the world. It is interesting to visit museums to study the specimens there and become familiar with their look. Rockshops are always very helpful if there is one nearby. You can look at them and ask questions, but it is not a good idea to pick up a specimen without permission. Some are too easily broken.