Bushwalk Australia

FWIW: I have a Sea-to-Summit UL insulated mat (large size). I bought this $3.00 bag from Kmart to enclose the mat for the following reasons

Keeps my mat clean
stops "squeaking noise" coming off tent floor
When using my sleeping bag as a quilt/blanket, the $3 cover is better to sleep on than the mat itself

What's it weight and what are the materials?

I did see these in the local last weekend and bought one. They are 100% synthetic, not cotton. But for $3, worth throwing into the gear stack.

K-Mart also had the collapsible (silicone) drink bottles for $5.50 which do screw onto the bottom of the MSR miniworks filter. Handy to have as part of your water treatment plan.