Because of how well the boat-cloak did during his tests, Halkett built a larger version. This boat could be folted into a knapsack. When inflated, it could carry two men. Each man would use a paddle on each side of the boat. When deflated, the boat could be used as a waterproof blanket. This would allow the users to sleep on wet ground. The people in charge of the Royal Navy though the boat could be useful to some people but was not likely to be useful to the Navy. On 8 May 1845 Lord Herbert, First Secretary to the Admiralty wrote to Halkett that "My Lords are of an opinion that your invention is extremely clever and ingenious, and that it might be useful in Exploring and Surveying Expeditions, but they do not consider that it would be made applicable for general purposes in the Naval Service".