I recently came up with a watertight solution to the plastic tote I had been using for years to hold my camping supplies.
Step 1: Find Rain Barrel With Screw Top
I found an old pickle brine barrel locally for 25$. I prefer the screw top, but you can use the ring clamp ones as well.
Step 2: Fill With Supplies
I was able to stuff this 55 gallon drum with all the following:
Coleman Hampton 9 person tent
2 Coleman sleeping bags
Coleman queen air mattress
Coleman twin mattress
12 volt pump
Step 3: Go Camping
Toss the barrel in your truck and go. Hope this helps save you some space and keeps your gear dry like it did for me! Thanks for looking.