diff --git a/backpack-organization/main-box.scad b/backpack-organization/main-box.scad
index 0a5509f..c85963a 100644
--- a/backpack-organization/main-box.scad
+++ b/backpack-organization/main-box.scad
@@ -5,7 +5,7 @@ $fn=128;
 outerWall=4;
 innerWall=2;
 layerClearance = 0.5;
-verStr="v3";
+verStr="v4";
 font="Montserrat";
 
 // as a convention, outer dimensions refer to measurements from outside wall to
@@ -138,7 +138,7 @@ module audioTrayBlank(s, h) {
 
 module audioTray1() {
   difference() {
-    audioTrayBlank(s = audioTraySide, h = 14);
+    audioTrayBlank(s = audioTraySide, h = 15);
 
     translate([(audioTrayIS - 52)/2, innerWall, innerWall])
     union() {