Stretching and straining to reach the top shelf is almost asking for injury, so play it safe by keeping a stepladder close at hand. When you buy, pay attention to the ladder's load capacity; you'll want something that can support the weight of anyone who may use it. This option from Rubbermaid is a great choice for tight spaces. Not only does it give you a little extra height, but it easily folds up and out of the way. Available on Amazon; $36.45.