One of the most useful accessories you can add to your bike.Saddle bags are the perfect place to store the spare inner tubes, tyre levers, multitool or other small repair items you should always ride with.
They usually hang underneath the back of the saddle itself with a couple of straps, with another strap to secure it against the seat post. Most bags should fit any bicycle. You can get some bags that have a hard shell and secure directly to the saddle.
You can get a range of sizes, from tiny ones that carry the bare essentials, to larger ones which can fit in some snacks and potentially a paclite jacket.
Bigger bags will be heavier, especially if filled, so as a general rule get the bag that just fits the essentials for most of the cycling you do. Bigger bags in particular can catch your legs when cycling. Check this doesn’t happen before starting a long ride or race.
Most bags aren’t completely waterproof, but are fairly water resistant. If you are planning on storing a phone or water sensitive items in there, we’d recommend popping them in a plastic bag first.