Sandbags Corner Long
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 (23 POIs)
Champions Coliseum (tier 5), Navezgane County Jail (tier 5), Red Mesa Compound (tier 5), U.S. Army Post #7 (tier 5), ChemTech Distribution Center (tier 4), Close Encounters Gun Range (tier 4), Fort Bags (tier 4), Fort Camo (tier 4), Fort Choppa (tier 4), Fort Quonset (tier 4), Hotel Zombona (tier 4), Installation Blue Ridge (tier 4), Navezgane High School (tier 4), NDC Checkpoint Three (tier 4), Stand Tower (tier 4), Fortified Farm (tier 3), Forward Supply Depot (tier 3), Journey's End (tier 3), The Serrano Residence (tier 3), Jerry's Fill (tier 1), Camp BBQ, Camp Bravo, Lost Soldiers.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.