I was looking up solar chargers on YouTube and it seems like there are plenty of review and comparison videos. I wasn't sure how light/small Justin wants to go. You can make your own that will fit in a pistol box. Those would be fine for car camping or a canoe trip or something, but not something you'd want to hike with. Can set it up however you like though.
25AH seems like a LOT in such a small package. The deep cycle I use in my van on that solar set-up is only I think 18AH and that battery is 10x as big as those products.