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The bottom bag is the Adventure Low bag.

https://snowmobiles.polaris.com/en-us/shop/accessories/storage-bags/2884455/

28884455 Adventure(long)Tunnel Storage Low Height. Lock & Ride Flex Mounting. $295US available
16Lx17Wx7H 23Liter

 

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Here's how much room is left on the tunnel with the Adventure tall mounted on a SBA 146:

 

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The Ride N Lock bags are very sturdy and tight. The liner bags, just make it easier to take something nice and dry into your motel at night.

 

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When you have the liner bag, you can leave the Adventure bag, that may be wet, dirty or frozen to the tunnel, on the sled. The Adventure bag, always kept everything inside of it, dry.