Sandbags Pile 1
Sandbags are not very sturdy but can be put down quickly and provide decent protection from bullets.
Crafting
Craft at Backpack · makes 1
Crafted as 
Sandbags: pick this one of its variants when you place it.
Crushed Sand× 4
Cloth Fragment× 15
Harvest drops
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
Where to find (34 POIs)
Navezgane County Jail (tier 5), Camp Hollow Point (tier 4), ChemTech Distribution Center (tier 4), Fort Camo (tier 4), Housing Development (tier 4), HSP Logistics (tier 4), Installation Blue Ridge (tier 4), Judy Witch (tier 4), Navezgane High School (tier 4), NDC Checkpoint Three (tier 4), Richard Munchz Plaza (tier 4), Shotgun Messiah Range (tier 4), Stand Tower (tier 4), Fort Razor (tier 3), Forward Supply Depot (tier 3), Journey's End (tier 3), Law & Order Square (tier 3), Navezgane Falls Diner (tier 3), Weston Weigh Station (tier 3), Animal Hospital (tier 2), Jericho Ranch (tier 2), Ma Baker & Sons Bakery (tier 2), Pal's Marina (tier 2), Cabin Retreat (tier 1), Mausoleums (tier 1), Skamson Grocery (tier 1), Swiggin Serum (tier 1), Camp Bravo, Cascade Tower, Eric's Stuff, Fortified Fizz Cola Warehouse, Outlaw Outlets, ParKing Garage #1, Wrong Harvester.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.