OMG, TWINSIES! The Twinsies Dual Bottle Cage Holder allows you to mount two bottle cages to your saddle rails for easy reach. Here's a non-exhaustive list of potential uses:

• Long, hot training rides
• No water bottle eyelets on your bike frame
• Frame bag taking up all the space on your bike frame
• Extra hydration for bikepacking
• Easy reach for kids on the back of your e-cargo bike