When I was a kid, we used photo albums. The kind where you lift the plastic sheet and put the photos under. This way we never even peeled the stickers from their backing.
It's not really an island though. There's just more garbage there than elsewhere.
Despite the common public perception of the patch existing as giant islands of floating garbage, its low density (4 particles per cubic metre (3.1/yd3)) prevents detection by satellite imagery, or even by casual boaters or divers in the area.
For anyone curious, It's Always Sunny in Philadelphia S04E11 "The Gang Cracks the Liberty Bell"