Check a tackle tray against your measured backpack compartment in all six orientations, then calculate stack capacity with clearance.
Measure the usable interior opening and compartment. Enter actual tray dimensions, including hinges and latches. All measurements below are inches.
Best orientation: 10.75 × 7.25 × 1.75 in; arrangement 1 × 1 × 4.
This is a dimensional estimate, not a compatibility promise. Curved corners, fabric taper, zippers, dividers, tray weight and access space can reduce the usable count. Clearance is removed from both sides of each compartment dimension.
These listings match this tool’s next decision; they are not a substitute for measuring your gear or reading the model guide.
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accessory
This KastKing utility-box offer is a four-pack in the 3600 family. A four-box backpack still needs compatible internal dimensions and clearance for the latches.
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accessory
The Plano ProLatch package contains four 3700 StowAway boxes with transparent bodies. Check each box’s depth as well as its 3700 footprint against your compartment.
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