This is the best way Iv found to fold a 10,000L bladder tank
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Step 1: Flatten the Tank
Get as much water out as you can and pull the tank as flat as possible leave the valve cap on.
Step 2: First Fold
Fold in both side a foot or so.
Step 3: Cover the Cap
Fold in one edge to cover the valve cap and exit pipe and fold the other side up to meet its edge
Step 4: Final Lengthways Fold
Fold the other side over the top.
Step 5: Know Where the Cap Is
I’m using my foot to feel where the cap is. This is helpful as to know where to make the next fold.
Step 6: Starting the Longways Fold
Start to fold longways about 2 foot per section , the folds can be made longer to make sure the end cap ends up in the right place.
Step 7: Check the Valve Cap
Make sure the valve cap is not being bent or on a edge. The caps position is shown in red
Step 8: All Done
Finish folding the tank and it should look like this.