I carry a mini-backpack into the parks and I keep everything inside in separate, small, clear plastic baggies. Sunscreen in one baggie, tissues and wipes in another one, etc. Several security officers complimented me on the plastic bags. They said it made it so much easier to check my backpack. Also, with only two compartments to check (that I had opened for them as I approached the counter), I breezed through. Other guests had huge backpacks with multiple zipped compartments and then opaque zipped bags inside, and those guests took forever in bag check. And if you have a choice of lines, look for one with no strollers -- stroller parents bring so much more stuff into the parks than adults with older kids or no kids, so their lines move more slowly. - Stacey I.