BKNOOU 40L Lightweight Hiking Backpack Packable Camping Backpack Waterproof Travel Daypack Men Women Foldable Hiking Daypack, Green

From the picture it looks like it’s small. I’m thinking the heaviest thing is the surface. You could try to replace that with palette paper. I also bought the backpack below. The key is to find one the had the buckle for the pole and put the tripod in the water bottle pocket and strap it the pole holder. Also lessen the number of paints you take. https://www.amazon.com/dp/B0D5L7PM96?psc=1&ref=ppx_pop_dt_b_asin_title