The Kriega US-Drypack Hook Strap is an upgrade option for use on the (pre-2012) US-10 and US-20 tailpacks or replacement fitting set for US-10, US-20 and US-30 DRYPACKS.Custom 6061-T6 alloy hooksMulti-position: inline or across bike seatEasy on/off bike (no loose straps left on bike)4 x Acetal ITW Airloc buckles4 x 20mm sub-frame loops10 year guaranteeThe Kriega US-Drypack Hook Strap provide an extra secure sub-frame fitting kit which allows tailpack combinations of up to 90-litres. The fitting straps have been designed to fit virtually any style of bike, particularly suitable for traditional one-piece seats or bolt-on seat-pads/racks.Please note - Some bikes already have web loops attached to the seat-pad/base. In this case we still recommend the fitting of the Kriega loops, as fitting to the subframe is far stronger than to the seat.Fitting - Remove bike seat and locate the best mounting areas on the rear subframe. It may be necessary to slot the internal plastic tray if no subframe