Buy Hydro-Pack from Ed

Buy Hydro-Pack from Ed was a mission in Ratchet & Clank. Ratchet and Clank found a RoboShack owned by Edwina, who was so smitten with the latter that she offered him a Hydro-Pack upgrade for 2,000 bolts, to the dismay of the largely ignored Ratchet.

Walkthrough
Although technically not part of the mission itself, the path to reach it is nonetheless described below. Start from the landing pad and follow the route used in "Destroy the Planetbuster", stop before using the floating platform to cross the ice and turn around, instead using a different floating platform to scale the cliff face and enter a tunnel. A group of blarg troopers will appear in an attempt to stop you, but are easily dispatched even by the Bomb Glove. Jump down the large cylindrical chamber to enter an even larger cavern with a series of Insta-Faucets and Insta-Drains.

The latter are generally always hooked up to a canister containing compressed water, which must be drained and deposited into an Insta-Faucet to flood the chamber. With the rising water you can access a small island and enter a tunnel, draining more water, and then using the Hydrodisplacer placed into a different receptacle on a small plateau accessed by a buoyant platform. Use the small buoyant platform to access another Insta-Drain, followed by a final Insta-Faucet on the other end of the room, which causes the water to rise enough to allow you to exit.

Go through a tunnel to find a large canyon, with several bridges and conveyor belts spanning the gap. Accessible buildings are placed on both sides and a large number of explosive and other crates are strewn throughout the location. Anklebiters will sometimes ambush you from out of the snow on the floor, and a few blarg troopers occupy some of the structures, but otherwise your trek to the RoboShack is unhindered. Enter it to properly start the actual mission, subsequently ending it by paying Edwina.