Bicycle "saddle bags" are known to the trade as "Panniers" and a search for them will produce many different makes in a huge range of sizes, prices and features.
First you need an accurate definition of what "all my gear" means. Are you an ultra-light camper or a luxury camper? Do you want to take all of your electronic toys like a laptop, smart phone, camera, etc. or will you only take the absolute necessities? Do you plan to travel with a 20 pound load or a 60 pound load? Those choices will determine how many and what size panniers you require. As to cost, features and quality, those are a function of your budget and how much use you plan to make of them in the future.
If you are going to take a fairly large or bulky load, you will need both front and rear racks for your bike and a set of front and rear panniers. If you are a very light traveler, a rear rack and a set of rear panniers should be sufficient.