A Pelican Case is perfect for a bike because they are "Unbreakable, watertight, dustproof, chemical resistant and corrosion proof...just some of the features that Pelican™ offers and total protection for your equipment. The Pelican dry box is made of ultra-high-impact structural copolymer that makes it extremely durable. Its exclusive 1/4" (6.4 mm) neoprene o-ring and ABS latches seal perfectly and it includes an automatic purge valve for quick equalization after changes in atmospheric pressure. Your equipment can fit into the high-density foam of the case for total subjection and protection against impact, vibration or shock. This case is NATO codified and tested to IP-67 (Ingress Protection). You break it, Pelican replaces it... forever."

http://www.amazon.com/Pelican-Water-Tight-Protective-Pelicase/dp/B000EBMCHE/ref=sr_1_14?s=sporting-goods&ie=UTF8&qid=1391288855&sr=1-14&keywords=small+pelican+case (Case I used)

http://shimanocenters.blogspot.com/2009/11/nirve-classic-mens-cruiser-bike-product.html (my bike)

Step 1: Tools and Items Needed

Tools and Parts

-Drill
-Big Crescent Wrench or a Bike Head Set Wrench
-Assorted Ratchets and Sockets
-Allen Wrench
-Drill Bit
-Wrench for MountingNuts
-Screw Driver for Bolts
-Assorted Nuts and Bolts
-Razor Blade

You will also need mounting hardware to be able to mount from the wheels and headset.

http://www.amazon.com/Nirve-Basket-Mounting-Hardware-Black/dp/B000QFRSNG (This is what I used)

Step 2: Removal of Handle Bars

First take off the allen bolt on the top off the stem using an allen key. The handlebars should come off after this, take off the nut underneath it by using a crescent wrench.

http://www.nirve.com/support/docs/Nirve_Basket_Installation.pdf

use for reference

Step 3: Shaping the Headset Mount

now we need to shape the headset mount to fit the box. Put the mount into the vise and start bending until it is shaped the way you want, mock it up on the bike to see if it will work.

Step 4: Lower Mounting Brace

Mount the lower brace by drilling and making two holes into the box carefully. After this bolt the lower mount onto the box and tighten it down.

http://www.nirve.com/support/docs/Nirve_Basket_Installation.pdf
instructions for original basket

Step 5: Mounting the Box

Now you need to put the upper mount onto the box.

-Sand down the front of the box so that the mount has a flush area to be on.
-Drill holes for the mount
-Line up the holes and bolt it on
-Put it on the bike for final mounting

Step 6: Final Steps

Steps to finish the project

-Using the crescent wrench screw the locknut back on

-Put the handlebars on by using the allen key

-Unscrew wheels bolts and put the lower brace on

-Tighten the bolts back on