Ive seen a couple of "buckets" made from IBC's, cut it down vertically and use the side rather than the top or bottom. And then when you get home just throw it on the lawn and wash it out with the hose. I had a "bucket' made from PVC, extends right up the back of the seat and has velcro tabs that fit around the rear head rests to hold it up. About 200mm up the side and rear, the sides held up by a small hook front and back. And the rear sits flat until you shoot something, then folds up behind the deer to keep all the blood in. The corners are pocketed, so theres no stitching on the bottom half of it and it doesnt leak.
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