Since this is a speed sewing challenge I decided to take it literally and sew a project as fast as possible with little fuss. I made this pannier in 90 minutes though it's my second one so there wasn't so much fiddling like the last time, and you all are benefiting from the improvements I've made after testing the first one. These panniers were inspired by the Arkel Dry-Lite pannier which I wanted but which cost 90 dollars. I made my set for about $15 and they work fine. The one thing to be aware of though is that if they're not full, they can catch the spokes. You could add a cross spar if you plan to ride with them unfilled.

Supplies

1/2 yard outdoor fabric such as ripstop nylon or silnylon

13 inches of sew on 2 inch velcro

one buckle

42 inches of 1 inch webbing

Step 1: Cut Out Your Fabric

Cut out the fabric. The dimensions are 25x16.5 inches and the missing triangle is 5.5x14 inches. You will need 2 pieces for front and back.

Step 2: Sew a Loop of Webbing

Take 42 inches of webbing, add both sides of a buckle to it facing in the same direction, and sew it in a loop.

Step 3: Sew All Around the Bag, Not the Top 3 Inches

Put the 2 pieces of the bag together and sew around the bottom and sides but don't sew the top 3 inches.

Step 4: Invert the Bag

Invert the bag and then do something to cause the seam allowances to go all the way up to the top without sewing the top 3 inches together. Probably an iron would be ideal. I didn't want to wait for my iron to heat up so I just tacked it at the top.

Step 5: Roll the Top 3 Inches of Bag Fabric Arround the Webbing and Sew It at the Sides

The 3 inches at the top of the bag get folded over and around the webbing. Leave a larger loop of strap at the back side of the pannier which is the side with the vertical edge. This is the most difficult step. When you are done, sew the webbing together on the sides where the fabric ends.

Step 6: Swe Across the Top and Bottom the Webbing on Both Front and Back

To clarify you are not sewing the bag closed you are just firmly attaching the bag fabric to the webbing all the way around the top.

Step 7: Sew on the Velcro Hangers

Mark 5 inches from the top and 1/2 inch from the front (the side with the triangle cutout for your foot). Take 12 inches of velcro and overlay it 3/8 of an inch sticking the loops to the hooks along it's length. Pin the Velcro onto the line and use a zig zag stitch to sew it down.

Step 8: Trim the Velcro to Fit Your Rack

Your rack has vertical supports that the velcro won't go around. Use scissors to cut these sections out.

Step 9: Hang the Pannier, Mark for the Bottom Strap, and Sew the Bottom Strap

Hang the pannier and use a marker to mark where the bottom of the bag will attach to the frame. This is the point where the verticle supports come together. Take another 2 pieces of 2 inch velcro about an inch wide and overlap them 3/8 inch so they stick together as you did before. Then place this piece on the marks you made and sew it down.