Abstract: A closure having a first flange with first engagement mechanism and a second with a second engagement mechanism disposed between the first end and the second end. The first engagement mechanism configured to engage the second engagement mechanism. A slider configured to selectively engage the first engagement mechanism and the second mechanism when moved in a first direction and disengage the first engagement mechanism from the second engagement mechanism when moved in a second direction. The closure is substantially watertight in the closed position.

Abstract: An improved apparatus and method for converting two single rider bicycles into a tandem tricycle is provided through means of extending the rear axle of the front bicycle of the tandem by rear axle extenders. The rear axle extenders are in line with the rear axle and provide a bearing upon which a modified front fork of the rear bicycle is mounted. The bearing is positioned outboard on the rear axle extenders by a distance sufficient to allow the modified front fork of the rear bicycle to clear all gearing or transmissions provided on the rear axle of the front bicycle. The modified front fork of the rear bicycle is modified to provide a distance of separation between the tines of the fork to allow for this clearance. Front axle extenders are also provided to the front axle of the front wheel of the rear bicycle when the two bicycles are disassembled to allow them to be used once again as single rider bicycles.