Game bag!

Get some inexpensive REI dry sacks that kayakers use. I carry that in my backpack with a 4-5 bottles of frozen water to keep the game fresh and/or drink when thirsty. I usually field dress them right away or at least get rid of inners so they don't spoil, put them plastic bags and into the dry sacks. These bags are tough with rip stop materials and super light too! I haven't found better solutions. 

https://www.rei.com/product/800889/sea-to-summit-lightweight-dry-sack-1l

https://www.amazon.com/Osprey-UltraLight-Sack-Shadow-Grey/dp/B00M45LC3I/ref=sr_1_17?dchild=1&keywords=dry+sack+ripstop&qid=1609727366&sr=8-17

https://www.amazon.com/Outdoor-Products-3-Pack-Purpose-Assorted/dp/B079TKKCVP/ref=sr_1_4?dchild=1&keywords=dry+sack+ripstop&qid=1609727324&sr=8-4






 
I use 3 types of bags depending on how long I'll be out. For 6 or more hours I wear a day pack. I can carry my lunch and if it warms up I can unzip the sleeves of my jacket and easily carry them. If it's a sit and wait type of hunt, I take an over the shoulder bag. When I'm hunting locally and never more than 1/2 mile from my truck, I take a waist pack. The day pack and over the shoulder bag were purchased at Menards for $10 each. They usually have hunting items cheap this time of year. The over the shoulder bag has a clip on the strap that can be used to remove the bag quickly if needed. The waist bag I bought for $5 at Rural King. It's made for fishing tackle and came with Plano boxes. The nice thing about the waist pack, the inside is vinyl so I don't have to put the squirrels in a plastic bag first.

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Addison- go to cabelas or bass pro and look for the dove bags. Imagine a set of bags that construction workers use, and this is basically what you have. One in each side and one in the rear. It utilizes an adjustable snap belt, the pouches are wide and deep and lined inside with a washable plastic barrier. Years ago I use to throw my squirrel harvests inside those pouches.