I have the big RTIC soft side. Yes, the zipper is stiff when they are new. It has to be tight or it can’t hold in water should the cooler tip. They do break in and get easier to open.
1. The zipper lube is not vaseline. It’s silicon mixed with wax. Use it, it works. With the cooler open, spread it evenly along the teeth and both sides of the seals (inside and outside). Use your finger to spread it evenly.
2. Spray silicon lube on a cloth and wipe the zipper (again, with the cooler open so you can do both sides. Wipe it several times with the cloth almost wet with silicon lube. Allow to dry.
Don’t understand the uber expensive soft cooler craze myself…..
The RTIC soft side is awesome. Best cooler I’ve ever owned. It’s the only small cooler I’ve ever had that can sit in the sun in a boat for 2 days and still have ice left in it. Terrific ice-keeping ability for the size and weight.
Also, the key advantage to the soft sides is they don’t weigh 3.5 tons even when empty like the rotomolded coolers do. Key consideration for anyone who goes where space and weight are a consideration like on a fly in or a float trip.
Grouse