23 Simple And Essential Hiking Hacks! Make your own walking staff. Walking sticks help with stability and balance and are especially good for your knees and back on a long hike. Learn more tricks and you’ll be king of the trail.
A hula hoop, a shower curtain & a large bag of water = portable shower:) All can be gotten at Dollar Tree, too! If left in packaging, practically no space (except hula hoop, but that's not hard to remedy!
Mommy, I Have to Go Potty! Make Your Own Emergency Toilet
I would also put a second protective bag over the cushioned pool noodle toilet seat to catch splatters (yuck.) An easy, DIY, camping / emergency preparedness toilet that's also good for those long-distance vacation road trips!