These bags are great! Theyre big and worth the price. I originally bought a tube and tip set for these bags and I ended up not needing it! My friend suggested I cut the tip of the bag slightly and pipe the frosting out. This has worked out well for me each and every time! No tip or coupler needed for me. I used these bags my first time decorating a cake and it was a job well done! Obviously for those who want to make specific designs that involve stars, flowers, etc might need a tip and/or coupler for this bag. But for general/basic designs, cutting the tip works well!! I fill these bags up with buttercream, pipe, then open up the bag from the top, pour in more buttercream, then continue piping. As long as each step is done slowly, you can avoid making a big sticky mess! This bag is very strong and durable. It could never rip on it's own even if you tried! Once your done with the job you won't be able to re-use these bags a different day. It's obvious the plastic would wear-aware over time of extensive use.