This is all done on the underside of the shell (AKA the EVA oval part of your shell). Take your backpack straps and mark where on the shell you will insert them. Take your insulation tubing and measure it out around the shell. Take your EVA foam and start filling in all the gaps. Your shell should look something like this now (pic 3).Ħ. ![]() Then repeat the process for diagonal strips. From there, repeat the process so you have a strips that goes horizontally. will allow the pipe insulation foam to have a lip to glue onto. You can use your heat gun to warm the EVA foam to have it bend a little bit if easier. You WANT to glue the strips a bit over the edge of the oval to create a lip. Determine how bulbous you want the shell to be at this point and glue the strip onto the oval template. Now take your EVA and cut a long, wide strip to go vertically down the middle of the shell. Take your template, transfer it to EVA foam, and then cut out the oval from it.ĥ. You should have an "oval" type shape now. Cut out a curve and then open up your paper. Transfer the measurement onto the paper and fold it in half vertically and then horizontally.ģ. Then you need the width of your back, which is usually about armpit to armpit. ![]() You need to measure the size of the backpack so measure from the back of your neck to the bottom of your waistline.
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