/diy/ - Do It Yourself

I want to /diy/ a bag that attaches to a bike rack. I'm willing to modify and even to make a bike rack myself if a special design is needed. The objective is to make a bag that attaches quickly to the rack without wasting any time. So I would be doing both, the rack and the bag so I can design them to work together.

There are multiple bike racks and all kinds of different bags on the market but all of them share one fatal flaw: their attachment systems suck and are usually strap based, This is totally time inefficient and frustrating when you need to put or to take your bag quickly.

My solution to this problem is to produce a bag and rack that are designed around a superior attachment system.

Now, my questions is: what type of attachment system should I use to create this project? I don't know anything about attachment systems.

I have two ideas that may work:
-The bag has magnets on the bottom. The rack has magnets on itself. The attraction force should be sufficient enough to hold the bag in place.
-The bag has a rail on the bottom. The rack has a rail on itself. The user pairs the ends of the rails and slides the bag till it locks in place. (similar to the telescopic rail that drawers have).