I'm what you would call poor, and even I can afford a couple of lockers a day. Backpacks? Why's it even an issue? You don't need all that stuff. Towels, clothes in the bags? Locker. The less we have with us, the better. You buy something at BGW, tell 'em you're riding some more, no matter what it is, you can pick it up as you leave, you buy several things, they put 'em together. It's not an at my convenience thing, it's my fault if I want to go to a waterpark or on water rides, I have to go back to my locker and get dry clothes. People stop while they're walking with backpacks, look around like where am I, and then get ran into by people like me, who thought everyone wanted to continue moving on. People turn around, they could knock you down. For a backpack to be properly worn, it's like it's gotta be filled way out. Backpacks aren't cool, IMO, I've waited to get into the parks several times while somebody is getting searched. What you got in there? Anyways, with the way I look, they'd probally dump my bags out and ruffle through the contents looking for "something" that's not in there.
Waterproof pants, zippers on the pockets, even fannyrigs, amusement park, not national park, no stuff to clutter.