Zoom UL Insulated Wide, Reg 7.5 x 9 in / 19 x 23 cm There is an expansion slot

There is an expansion slot to add an additional NOCQUA battery for longer life (sold separately)

the KeyRing can hold plenty of them

Whether your style is gourmet or just get it done

holding a fall

Zoom UL Insulated Wide, Reg 7.5 x 9 in / 19 x 23 cm There is an expansion slotDesigned for ultralight backcountry adventures, the Zoom UL Insulated eliminates the need to compromise between comfort and weight savings. With a generous 4. 3 R Value for three season use, sustainably sourced materials, and aviation grade lamination for ultimate reliability, the Zoom UL provides great sleep in the backcountry, at an incredibly low weight.