Sandbags End 3
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 (50 POIs)
Area 7 (tier 5), Dishong Tower (tier 5), Higashi Pharmaceutical (tier 5), Navezgane Corrections (tier 5), Navezgane County Jail (tier 5), Ostrich Hotel (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), Don Vittorio Spagetto Residence (tier 4), Downtown Marketplace (tier 4), Favales Academy (tier 4), Fort Bags (tier 4), Fort Camo (tier 4), Fort Choppa (tier 4), Fort Quonset (tier 4), Goldrush Station (tier 4), Installation Blue Ridge (tier 4), Navezgane High School (tier 4), NDC Checkpoint Three (tier 4), Shotgun Messiah Range (tier 4), Stand Tower (tier 4), Fire Station 8 (tier 3), Fort Razor (tier 3), Fortified Farm (tier 3), Forward Supply Depot (tier 3), Jim & Tim's Bullets and Booze (tier 3), Journey's End (tier 3), Pop-N-Pills (tier 3), The Hyde Residence (tier 3), The Serrano Residence (tier 3), Weston Weigh Station (tier 3), Jericho Ranch (tier 2), The Contino Residence (tier 2), The Curren Residence (tier 2), Cobweb Cottage (tier 1), Jerry's Fill (tier 1), Radio Outpost (tier 1), Arkco Rusco and 10 more.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.