How to make a waterproof bag

Sealock has been manufacturing different kinds of waterproof bags since 2001,we are the expert on the high frequency welding.

What’s the difference between the waterproof bag and daily use bag?

Normally the daily use bag is made by stitching,the main material is woven fabric with PU,TPE or PVC backing,or use PU PVC leather.No matter the main fabric is water resistant or not,the main part of the bag are sewing.The structure can be complicated with many pockets and layers.

For the waterproof bag,there are two kinds of making way.The first one is sewing the whole bag or part of the bag,and heat seal tape inside,at the position of the sewing line.It can stop the water leaking in.The other is using high frequency to make the whole bag,if you need to sew part of the bag,then make sure you already welding the patch at the back side of it,to stop the water leaking from the thread holes.Be sure that using waterproof fabric like PVC or TPU as main fabric.Normally the structure of waterproof bag will be simple,as it is limited by the welding tooling.The whole bag is welded by simple straight line together with other shape tooling,like square,circle,oval or arc-shaped etc..The tooling cost from hundreds to thousands dollars for one bag,it depends on the structure and size of the bag.

How to make a waterproof bag?

We do OEM most of time,so the first step is getting the artwork or reference sample from clients.After getting the artwork and reference sample,we will check each details to see if it is workable to make the waterproof bag according to clients’ request.If not then we will communicate with clients to make the revisement.The second step is make the prototype paper design by Pro-E system in R&D department.After it is completed,then we will arrange the material cutting,sewing and welding.The final step is testing the bag to make sure it is waterproof and durable enough.It will be same step in workshop for bulk order,except no need to proceed the prototype making.

We welcome OEM all kinds of sports bags,no matter the waterproof bag or sewn bags.Feel free to send us your samples or artwork.